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35% Hydrogen Peroxide


Nealv9z
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Hi, I am defnitely a newbie and seriously confused and conflicted. I have a fairly new Beachcomber hot tub. The tub is not my issue (so far), it is the chemical balancing act requirred to enjoy this fairly expensive hobby.

Initially, I was given an expensive set of Chlorine based products, with other chemicals to control water balancing, so I could enjoy my hot tub which for me is also almost a necessity having major arthritis issues. I am, in fact, not enjoying my hot tub due to the reaction I am getting from the chemicals in my tub. In my efforts to properly balance my hot tub water, I purchased a Taylor testing kit that measures everything In my water. Initially my problems were due to high Combine Chlorine issues but I persisted and reduced those levels to an acceptable level. However, my skin irritation issues still persisted. I have had this tub for 8 months, I have emptied and refilled it at least 4 times. I talked to a water specialist on the phone today and he told my issue was not CC but was in fact CYA. He indicated that Chlorine products, by make up, introduce CYA into the water amd they never go away. They are probably the cause of my severe skin itchiness and redness. He suggested I switch to Bromine.

I read up on Bromine and I see that it may also cause similar issues. However, I see some people recommend 35% Hydrogen Peroxide.

Is this s good solution to my concerns? If yes, does anyone use this instead of Chlorine or Bromine and if yes, where can I buy it and how do I use it. I live on Vancouver Island.

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11 hours ago, Nealv9z said:

I read up on Bromine and I see that it may also cause similar issues. However, I see some people recommend 35% Hydrogen Peroxide.

Is this s good solution to my concerns? If yes, does anyone use this instead of Chlorine or Bromine and if yes, where can I buy it and how do I use it. I live on Vancouver Island.

I've used both bromine and chlorine, and I prefer chlorine. We initially chose bromine because my wife is extremely sensitive to chlorine, but we found the smell of the bromine to be a bit much, and we discovered that my wife is not really as sensitive to chlorine if the water is managed properly.

Hydrogen peroxide is not an approved sanitizer. In fact, it is not really a sanitizer at all, but rather an oxidizer. It is not safe to use only hydrogen peroxide in your tub.

The only approved sanitizers are chlorine, bromine and biguanide. Almost no one uses biguanide in a hot tub. I would personally recommend that you stay with chlorine. A chlorine tub that is properly managed should not cause skin irritation.

Have you checked with your doctor to see if you have a skin allergy to chlorine? Another possibility is a bacterial skin problem commonly referred to as hot tub rash. I have not heard of CYA causing skin problems, however, in a properly managed chlorine tub, CYA should be around 30 ppm, no greater than 40 ppm. The real problem with high CYA levels (ie 60, 80, or 100 or more ppm) is that it binds the chlorine, so it takes much higher chlorine levels to prevent bacterial growth.

In my opinion, the best way to manage a hot tub is the dichlor then bleach method which you can read in a sticky thread by Nitro above in this forum.

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Thanks mpurcell for your input. While I have read that Hydrogen Peroxide is not approved as a hot tub sanitizer, I have also read scientific documentation that does actually indicate that Hydrogen Peroxide is a natural disinfectant.

I measured CYA, CC and free chlorines in my hot tub as well as all the other chemicals (ph, alkalinity, hardness) and all were within specs. I guess I am determined to attempt this avenue which will be a combination of Hydrogen Peroxide with non-chlorine shock. My initial challenge will be to find the H202 and the test strips. I found the test strips at indigo.com so now on to the main ingredient. 

The good thing about trying it this way is that I can switch to Bromine quite easily if it doesn't work since H202 can coexist with Bromine.

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Actually, mpurcell, I was not especially looking for agreement but I was looking for people who actually tried it and either failed or succeeded. My initial query was "has anyone used it instead of Chlorine or Bromine". From what I surmised from your response,  you did neither, as it seems you never tried it.  I have been doing a lot of reading on the use of hydrogen peroxide in a hot tub. There are a lot of naysayers and misinformation out there. I try to acquire scientific information from reputable sources. There seems to be enough information out there supporting the fact that h2o2 does disinfect that is why it is used in wounds, for example. David Suzuki, a rather welll known science broadcaster and phd, has the following to say about h202:

"Hydrogen peroxide is simply water with an extra oxygen molecule (H2O2). Unlike chlorine bleach, it breaks down into oxygen and water and is kind to the environment. For most applications, hydrogen peroxide should be diluted to a three per cent concentration, which is how it is usually sold in pharmacies. Store hydrogen peroxide in a dark bottle out of direct sunlight.

On their own, vinegar and hydrogen peroxide are each strong germ killers. Used in combination, they're even better!"

 His is not the only article I read, you may also wish to read the Wikipaedia page on h2o2 which also states:

 It is used as an oxidizer, bleaching agent and disinfectant.

So, since you gave  a negative view of it (I do not know you by reputation but I have no reason to doubt your sincerity) and I see contrary advice from some pretty reputable sources, I decided to try it and, so far, I am very happy. No itching, clear water, residual levels of h2o2 are staying at acceptable levels (meaning it can still do its job) and a kinder treatment of my envitonment. 

This being said, it has only been a week so the jury is still out for me but it looks really promising.  The only issue I am having is that I need to adjust ph levels down frequently even though my alkalinity level is wiithin an acceptable range. 

I will update this thread with my progress eventually as testing continues.

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  • 4 weeks later...

Alright, it has been over a month since I tried this experiment. I am not sure how other HP users are able to have their tub working on HP but it didn't work for me (mpurcell, you were correct in your assessment of HP). It was great for 2 weeks but then it started to smell like bath water that had been sitting in a bath tub too long. I had been dumping HP in on a regular basis based on HP readings (over 50ppm) on my strips but quite quickly, it started to eat up HP very quickly after the 2 weeks. Obviously a problem. Then, white filmy stuff started to float on the water's surface which I found out later was White Water Mold.

Egad, now I had to go through superchlorination and draining my hot tub a few times.

It is finally clear and I am back to Chlorine and a balanced tub.

I gave it a try and I don't regret the experience. I now know it is not for me. My next experiment is to install a Nature2 mineral filter. I realize you still need Chlorine with it but as I understand it, I would need a lower level of Chlorine with this installed into my filter. I also purchased a TDS meter (total dissolved solids) to verify if the mineral filter really works once I start using it.

Upwards and onwards in my little lab called a hot tub😁.

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If you have WM you should do a purge with Ahh-some.

I tried N2 and found I used just about as much chlorine as without. If you don't use the tub for a day or two and don't maintain a base level of at least .5 PPM the water will get cloudy. This tells me the N2 is not able to maintain water sanitation by itself without the addition of chlorine. You end up constantly shocking with chlorine to correct problems.

I now use a low chlorine program where you add just enough chlorine to oxidize bather waste after each soak which leaves enough chlorine (.5 to 1 ppm) to maintain sanitation. To do this right you need to test at least once a day.

I just added an automatic liquid chlorine dosing system that adds a very small amount of chlorine at different times during the day. I hope to use this to lower the amount of chlorine I use and keep the chlorine levels around .5. This will reduce the need for testing.

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Thanks for your advice arobbert.  I have switched to low chlorine regimen also. I bought a mineral filter called Nature2 which helps sanitize the pool in conjunction with a low chlorine treatment of .5 to 1ppm. My initial issue of itchiness with horrible reddish skin from scratching so far has not returned. To rid the WWM,  I super chlorinated my tub at a very high level (as suggested by a water expert in my neighbourhood - he had a calculation as to the amount per volume of water) for 24 hours. Burnt off all the WWM. You could see the little black charred specks in tub. Emptied tub, cleaned it out and refilled and cleaned filter. This WWM procedure worked because my tub was not that far gone in regards to the WWM issue  (had not gone on for that long a time), as I understand it. Problem solved as far as WWM. 

Now running with low chlorine and Nature2 mineral filter and procedure recommended by Nature2 filter documentation (basically shocking with MPS prior and post bathing and maintaining close to .5 chlorine level or slightly above. Water is crystal clear and not irritating. I will reserve compete judgement on this combination until a few months have passed but it looks promising.

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  • 4 weeks later...

Wanted to share my experience using hydrogen peroxide in my hot tub. I also live on Vancouver Island btw.

You probably already know we can only get 29% h2o2 in Canada, which I found at Borden Mercantile in Victoria. I also bought the test strips online. I have to say it was the best thing I did! Very easy to maintain, no smell, and no skin/breathing problems for my kids and I. I found once I achieved the proper amount of h2o2 according to the strips, I only had to add a small amount to the tub, albeit more often than I had to when I used chlorine, to keep ALL important levels in check. This includes ph, water hardness, etc, that one should monitor no matter how one maintains their hot tub. I'm not sure why this is... possibly because Victoria already has soft water...but I honestly don't know.

But for sure, I made a point of checking the water levels more often, I had 2 filters which I alternated and hosed down frequently when the tub was in use.... and I drained some of the water out and replaced at least once a year. Really not a hassle when I saw that my young kids, one of whom has asthma, and the other really bad eczema, could enjoy the hot tub without any problems at all!! Added bonus: soft skin.

Absolutely I understand it's not an "approved disinfectant" according to those who make money from chlorine/bromine products and all other toxic spa chemicals, but my experience has convinced me this is a far better, cheaper, and safer alternative. But yes, no money to be made for them, sadly.

Also, 29% food-grade h2o2 will burn off your skin so, as with all other things, keep away from children and make sure it's properly labelled and stored out of the sun.

 

 

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  • 1 month later...

Hey mmaloof, would you please let me know how I can contact you. I am in Sooke but I would really like to know how you managed to use Hydrogen Peroxide without getting white mould (which is disgusting, take my word on that). It has been a while but I am starting to get itchy skin again which to me means I need to empty my tub and refill it as the CYA is building again. I would much rather stick with H2O2.

When I used that regimen, I always kept the H2O2 around 100ppm which is even higher than recommendations. I must have been doing something wrong if it works for you. BTW, you can get the 29% H2O2 from Lifestyle Market also. They sell a 4 litre container.

 

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  • 4 weeks later...

So, I am giving h2o2 another shot. It has been about 4 weeks and, as before, no issues. I am trying to be vigilant to see if the White Water Mold cones back again and to make sure  the chemicals are properly adjusted. One issue I am having is that my ph level always goes high quite quickly. I adjust Alkalinity and it goes higher, as expected, but when I put enough ph down to lower the ph level to the correct range, jumps up again the next day. It is a challenge to maintain it at a proper level.

Another thing I noticed is that when we are going through several bad days of rain and I don't use the tub during those days and keep the cover closed, h2o2 starts to dissipate more quickly so by the time I want to use it again (stops raining), it is very low. I think keeping the cover on for extended periods of time can cause issues.

I will update eventually one way or the other on this final attempt. If this doesn't work, I am going to have to switch to Bromine.

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  • 2 weeks later...

I wonder if your White Mold was caused by trees or some other natural source.  I have been reading everything I can get my hands on and from what I have gathered, those who think it is not a good idea do not have science on their side (it is a natural disinfectant and much more).  Yes, you need to be careful handling 35% HP but that is not a reason not to use it when you consider how toxic chlorine and bromine are.  

I wonder how it would work with the Nature 2 Pure filter set using Silver and Charcoal?

Does HP work standalone (from what I've read it does) or should I use MPS (Oxy-Spa) in low doses to assist.  I would rather not.  

I'm very interested in how Nealv9z makes out.

Thanks for your thoughts and suggestions.

Bob A

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Hi Bob A

Just to give an update, since you asked, everything seems to be going well. As indicated in my previous post, maintaining a proper PH level is almost a daily regimen. The one time PH dropped real low, I checked the Alkalinity level and it was low. I brought the Alkalinity level back to around 90 and PH levels went high again.

I expect you are more interested in the H2O2 situation more. Well, so far I have had no issues. No white mold, no cloudy water. I have added H2O2 about 3 times so far, since the initial shock making sure the H2O2 level stays over 100ppm. In total, I might have added about 500 ml.  I have a 4L bottle of 29% and I think this will last me for a while. Very happy with the quality of the water and the feel of my skin after a session. Interesting point about the trees as I do have some hanging over the tub but the cover is normally on the tub when not in use. I don't see a lot of tree residue in the tub, almost none except for the occasional little  piece of fir tree once in a while which gets picked up by my filter. 

Talking about filters, I have 2. I always keep an extra one clean and ready to swap in if I see yellowing of the one installed in the tub. I have swapped one out so far.

Lastly, based on some other posts in a different blog (Bill Clarke - if you haven't read it, I strongly suggest you do so)), I also dump in about 1/4 cup of non-chlorine shock (Oxy-Sparkle) and the appropriate amount of Water Clarifier every 2 weeks.

In summary, I am having a better success than my last attempt so far. My theory is, as long as my H2O2 maintains a level of around 100ppm (higher is not a bad thing), H2O2 is available to sanitize the tub. I also want to make sure my other chemical levels are where they should be (calcium hardness, alkalinity, ph level). PH drops low, I need to increase Alkalinity,  PH is checked daily and adjusted. I check Calcium Hardness once a month. Also, every 2 weeks, I dump in the Oxy-Sparkle and Clarifier.

I will update this entry again some time in the future as to whether things are still working with the above regimen.

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Thanks Neal for your update and great information. I think you are right about the N2 stick.  I wrote to the manufacturer last week and have not received a reply.  I know you are right that it needs Chlorine to activate and H2O2 will probably not do it.  I found your Oxy-Clean, same stuff (MPS), to be an interesting idea.  I use it now with great results and there is no reason why it would not work well with H2O2.  If it doesn't bubble when you pour it in, it probably does not react with it.  I rarely use Clarifier but I do have it and have used it a few times after a heavy bathing load (especially when dirty kids go in, they're in their 30's and don't shower first.  They just come, open the hot tub and jump in).  Keep us informed.  I will switch in the Spring when it's not so damn cold here (NYS) and I can run a hose without freezing (Spring will come, won't it!?!).  This has been one of the coldest winters I can ever remember and haven't used the spa once since November.  I still shovel off the snow in case we get a nice thaw but can't picture going out there even though I bought an outdoor propane heater which is one of the best things I ever bought and extends my Hot Tub season considerably, except for this f*#*#*# miserable year.  

This is a great website where you can buy and get some good information.  Of course they have a vested interest which is why I am doing additional research.  http://www.purehealthdiscounts.com/pool.htm#products.  If anyone else has experience, or knows other sites, please add to the conversation!

Keep us informed.

Thanks, Bob A

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On 9/1/2017 at 6:13 PM, Nealv9z said:

Actually, mpurcell, I was not especially looking for agreement but I was looking for people who actually tried it and either failed or succeeded. My initial query was "has anyone used it instead of Chlorine or Bromine". From what I surmised from your response,  you did neither, as it seems you never tried it.  I have been doing a lot of reading on the use of hydrogen peroxide in a hot tub. There are a lot of naysayers and misinformation out there. I try to acquire scientific information from reputable sources. There seems to be enough information out there supporting the fact that h2o2 does disinfect that is why it is used in wounds, for example. David Suzuki, a rather welll known science broadcaster and phd, has the following to say about h202:

"Hydrogen peroxide is simply water with an extra oxygen molecule (H2O2). Unlike chlorine bleach, it breaks down into oxygen and water and is kind to the environment. For most applications, hydrogen peroxide should be diluted to a three per cent concentration, which is how it is usually sold in pharmacies. Store hydrogen peroxide in a dark bottle out of direct sunlight.

On their own, vinegar and hydrogen peroxide are each strong germ killers. Used in combination, they're even better!"

 His is not the only article I read, you may also wish to read the Wikipaedia page on h2o2 which also states:

 It is used as an oxidizer, bleaching agent and disinfectant.

So, since you gave  a negative view of it (I do not know you by reputation but I have no reason to doubt your sincerity) and I see contrary advice from some pretty reputable sources, I decided to try it and, so far, I am very happy. No itching, clear water, residual levels of h2o2 are staying at acceptable levels (meaning it can still do its job) and a kinder treatment 

How are you measuring H2O2?  Where are you buying 35%?? It is very hazardous!

How much 35% are you adding?It gets diluted to almost nothing in 400 gallons - I can’t imagine you’re adding enough to keep the concentration high enough to kill pathogens. And even a tiny drop of 35% will damage skin tissue- in eyes cause permanent damage. 

3% decomposes at a rate of about 0.5%/year when kept away from light at room temp but at higher temp decomposes faster. 

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I can only get 29% h202 here in Canada. I buy a 4 litre bottle from a local store and I store it in my garage bar refrigerator. I follow the advice given in the blog started by Bill Clarke (http://bilclarke.blogspot.ca/2008/05/switch-your-hot-tub-to-hydrogen.html) for initial fill and maintenance, added with additional information from one of the contributors who goes by the handle "King Kong". There is a lot of information there and you need to do a lot of reading in order to find the right nuggets for your situation.

I try to keep the dilution at 100ppm or more (as indicated by the colour sticks) and I will usually top it up once it goes below that with about 150ml of h202. This seems to last me for at least a couple of weeks or more. I also add non-chlorine shock (quarter cup) and clarifier every 2 weeks.

My usage of the tub is once daily, weather permitting, and I bathe only after a shower and I wear a bathing suit. I am the only one who uses the tub.

Hope this is the information you were looking for.

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  • 4 months later...

I have been using 35% peroxide for about a year . It was pretty good . I had a few clouding problems over that year .I used a small amount  bromine to clear it . But now I had clumps of what looks like slime floating around . I drained the tub completely  disinfected it .   But I`m having clouding issues . The PH is high I have been trying to lower it for two days . Using a bit of bromine to try to clear the water . I`m changing the filter today and adding the Peroxide . I`m told if PH is high the Peroxide will disappear pretty quickly .

 

Any suggestions at what I`m doing wrong ?  

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Hi

So I never updated my posts from my last attempt at using H2O2 as a sanitizer because frankly, I didn't think anyone cared to respond who could support my similar question "what am I doing wrong"? There seems to be no way that I can visualize where my spa can support the use of H2O2 and not have problems, specifically white mould. On my second attempt, it took about a month and white mould came back. I never allowed the H2O2 to go below 100 and I changed filters weekly. I suspect my hot tub cover was part of the issue as in the winter there are long periods where the cover stayed shut for weeks due to heavy rains (sun kills the bacteria that creates white mould), even though I did open it up occasionally to ensure H2O2 levels were consistently over 100. 

I had enough so I zapped the spa and switched to Bromide Salts. My body seems to be more tolerant of this chemical (no itchiness).

As an aside, I thought I read somewhere that H2O2 and Chlorine can be mixed but not with Bromine. If you figure out how to make this work, I would really like to know because I preferred the H2O2 environment prior to the white floaties.

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  • 4 weeks later...

OK, so I now have 3 months under my belt with HP..  Do I like it Yes.  Water looks, feels and smells great, most of the time.  Are there difficulties?  Yes.  Here are some of them.  Advice is welcomed.

  • Levels maintained at 100ppm until not.  By that I mean, the levels go from 100 to 50 to 0 in a few days.  This is a problem.  Not sure if it is inherent with HP or I have a load that is sucking it dry.  My tub is rarely used.  It also has a cover I keep on it 99.9% of the time.  I figure this keeps the HP from escaping as well as keeping the water clean.  I once left it open over night and the pollen on the surface was disgusting.  
  • Occasionally cloudy, especially when the levels drop.  I've used clarifier twice now.  

Aside from this, I love HP compared to Clorine or MPS.  Would hate to have to switch back.

Bob

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  • 4 weeks later...

Hello,

   I'm in AZ, and it is bloody hot but I still keep my 200 gallon freeflow spa running, and on H202. I too have been through the water balancing issues, white water mold (specks on the surface, and the nasty snot looking floaties.)  Its been 4 years and I now I think I've got it. I only drain my tub every 4 months, change filters once a month and have had no water mold. Although I admit there is a slight smell after a months use, still crystal clear and the smell reminds me of hot springs. Better than CHLORINE! No shower required before or after. Note: I was a chemistry major and this may be more complicated to some. This is how I did it:

WATER BALANCING:

 (TA) Total Alkalinity is the culprit for uncontrollable pH, (we have hard water with TA of 1400 out the tap, with pre-filter) 50-120 is ideal range I believe, depending on CH. When TA is above this, pH will drift up out of range due to the chemical reaction with air introduced from the pumps. Muriatic Acid (HCL) is the most effective way to balance TA, but very dangerous. I wear googles, long sleeves and use a long metal knife to open a new container. Hold my breath and quickly pour directly into the tub, measuring it out is not recommended because of the fumes. For 200 gallons of hard water it takes almost a whole liter of HCL... However don't add it all at once. There are some detailed scientific guides out there but basically you want change the dose sizes in a cascade fashion. I add about a half cup, run the jets with air on high for 15 minutes (this is important to create the reaction with TA) then down to a quarter cup, another 15 minutes on high, 1/8 cup, 15 minutes, 1/16 cup, etc. I just eye ball it and check the pH between each dose. It takes about an hour or so. Once the TA is at 50 I only have to add acid every few weeks, or when topping off with water.

PREP & MAINTENANCE:

I use a hose pre-filter for hot tubs and let the water run for 5 minutes before filling the tub. This gets most bacteria out of the hose before filling. WWM lives in hoses I believe. Vinegar is all I use to flush the tub prior to draining and on the walls with a scrubby. I try to fill the scupper with clean water and let the motor push out the water in the lines, but I don't know how effective this is. Once its empty I give it 20 minutes in the AZ sun! A clean filter is soaking in filter cleaner (diluted) and rinsed clean to start the first cycle of water balancing. You must balance your water before you let the tub run over night or sandpaper scale can appear on the walls. Ouch it makes a nasty rash!

H202 SANITIZING:

Ok, now what you are waiting for! To be successful with H202 I gave it support. Its a weak oxidizer so it needs smaller particles. To assist with this I add a tablespoon (just like a dash) of spa enzyme every two weeks.  Too much and it clouds the water. I have an O-zone system which is compatible. I have always used the Nature 2 mineral stick, and MPS shock (oxy-shock) to activate it. The N2 manual states chlorine is required but MPS will work as well. The only reason it says you have to use chlorine is so their product can be considered an EPA approved sanitation system. I also use MPS on a case by case basis when the water gets cloudy or smelly. Probably once in a 4 month period. Now as for the H202 I use 35% food grade from the health food store, probably paying too much but a liter lasts me more than month. I never wear goggles or gloves like I do with the HCL. I have had the white skin burns from it but they go away the next day. Be as safe as you feel necessary. I add about a quarter of the liter at fill, and per other posters recommendations, stop the pump for 15 minutes after it circulates for a minute. This is supposedly to allow the H202 to fully react with any residual chlorine in the city water and remove it, thus preventing any smelly chloroamines from forming. Now the tub is ready. As has already been mentioned on this thread H202 dissipates faster than chlorine, making it more unpredictable. Test strips available online are required to determine a good schedule. I add when it drops below 100 ppm. About once every 4 days. Worth it.

So I use these inexpensive and easy to acquire products: Vinegar, Spa Pre-Filter, Muriatic Acid, Leisure Time Spa Enzyme, Nature 2 Silver Mineral Stick, Leisure Time MPS Shock, Filter Cleaner, Locally made 35% H202, Bart-O-Vation H202 test strips, OH and a couple scum bugs. Gotta have those.

Good Luck Clean Spa Friends!

 

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Hey, new to the forum. I’ve had my hot tub for about 4 years and the last 2 of those years I’ve used 35% H202. A little beige for just going with what a friend does to his without reading up on it but it works fine for me. I add 2 cups after water change with a good cleaning and touch it up with a cup in the near future. That’s it. Water stays clear, no smell, no cloud, easy on skin, just have to rinse or swap filter every double months, other than that it’s seems to be perfect. I do get the little rubber floaters after a bit but a filter clean and a little net to catch at any surface and it’s fine. Don’t actually use strips or check water at all, just go by feel basically and have had no problems. Great thread for info BTW

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Update time!

OK, We ran on just H2O2 for 3 months.  Kept levels at 100 or greater.   I had a slight clouding last month and fixed it with a little chlorine just in case and clarifier.  Also gave it extra H2O2.  This weekend, we got BAD clouding and it was disgusting.  Came out of nowhere.  White fuzzy caterpillars and brown snot.  Just gross.  I'm still trying to clear the tub and on my 2nd fill and need a 3rd.  Super high chlorine, reduce Ph to 6.2 and jet cleaner added.  Wife's nylon stocking in skimmer to catch this nasty stuff.  Most of it seems to come from the heating jets.  My water out of my tap is perfectly balanced for Ph, hardness etc.  Very lucky on that.  Spa guy told me I should be using Jet Clean every time I change the water so 5 years I have not.  That may have been the root cause of buildup in the pipes but I'm not sure.  I think I'm going to get this with the 3rd fill and high shock levels again.  May drive the 40 minutes to get more jet cleaner too.

Future:

Will try the H2O2 one more time.  Will add the Nature 2 stick and will give it a shock at the beginning to start it, let the chlorine clear and add H2O2.  Will add a little MPS each week and let it dissipate in air after every use (about once/wk).  Will watch H2O2 levels carefully.  I will update as things develop.  Hope this helps!

Bob

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