Recovering From Peroxysan

[kiamo]

Hi folks,

My name is Roger. My wife and I live in southern Alberta. Brand new to your forum (or any forum for that matter) lol. So bear with me. Greetings to you all!

sooo... I've read a few previous posts regarding this particular product and I'm thinking I'm liking "nitro's" methods better. I don't care for the "don't any other chemicals" policy, my pH, TA and so on are way out of whack!

New tub 3 mths ago, switched the water when I tried the peroxide 3-4 weeks ago. Winter in Canada sorta sucks so I'd rather not dump if I don't have to, so my question is:

can I get away with neutralizing the proxysan with bleach/chlorine back to zero so to speak,

and then start adding the Dichlor and sso on to swing it around? Or am I going to have to dump and start from scratch?

Thanx for any suggestions!

[quantumchromodynamics]

It would be best to drain and do a full decontamination procedure, as Peroxysan can leave a tub in an unsanitary condition. See the link in Nitro's signature. Decontamination

If you want to neutralize the hydrogen peroxide, you can use sodium thiosulfate.

[Edit]Using bleach (sodium hypochlorite) to oxidize hydrogen peroxide would be a better choice than using sodium thiosulfate pentahydrate to reduce hydrogen peroxide, because using bleach is pH neutral.

Sodium thiosulfate pentahydrate is acidic and adds a lot of sulfate to the water. I recommend adding the bleach in stages of a maximum of 15 ppm chlorine at a time.

OCl^- + H₂O₂ --> O₂(g) + Cl^- + H2O

Draining and refilling is still the best overall option.[End edit]

You can get sodium thiosulfate at any pool store. It is sold as "Chlorine Neutralizer".

Use 0.567 grams per 100 gallons per 1 ppm of H₂O₂.

[Edit]Use 0.6904 grams sodium thiosulfate pentahydrate per 100 gallons per 1 ppm of hydrogen peroxide.[End edit]

Example: 350 gallon tub with an H₂O₂ level of 50 ppm would need 99 grams (3.492 ounces by weight) of sodium thiosulfate.

Use half of the calculated amount of sodium thiosulfate pentahydrate and then retest in about 30 to 45 minutes. Try not to use more than necessary, as any unused thiosulfate will neutralize any chlorine that you add until the thiosulfate is gone.

I think that the bulk density of sodium thiosulfate pentahydrate (Na₂S₂O₃ + 5H₂O) is about 1.1 ounce weight per ounce volume.

[kiamo]

Hi, and thanks.

So if I've got this right....

last I checked my peroxide was 100-200ppm. (the test strips....)so I'll go with 100.

for a 350 gallon tub it would work out to 198gms. but use half that amount initially and then add a little more an hour or so later if needed?

then start working with the chlorine once things are neutralized....and so on.

I appreciate your sharing. I'm new to this, and like some others I've read, was a little naive about some technicalities. I need to invest in a "real" test kit. Soon.

Nothing like tubbing in light snow....

Roger