Bleach/Dichlor Method and MPS

[rmcderm313]

Hi All,

I have a question on using MPS with the bleach/dichlor method.  I'd like to use some to assist the dichlor/bleach with oxidization.  It sounds like a good idea to keep my chlorine demand low and there doesn't appear to be any significant downsides. My TA is low at 50ppm.  My pH is good at 7.6 but I have seen it drift up at times with use so using MPS should also help me keep pH on the lower side if I understand correctly.

I've also read that MPS can result in a false high combined chlorine reading. With my K-2006 test kit, I'd need to use the K-2041 to remove this interference.  It's $30 for 3/4 of an oz.. How much of this deox reagent in K-2041 do I need to add during a CC test?  How long would this K-2041 kit last with daily tests.

I'm hoping to hear from people who use (or have decided not to use) MPS with bleach/dichlor and whether using it is worth the cost of dealing with the K-2041. Or if straight bleach is just as effective and easier overall, even if you need to use more.

Thanks,

Rob

 

[rmcderm313]

3/4 oz with a dropper and instructions is $30

Amazon Kit

Just the R-0867 deox is $14 for 2 ounces

Amazon Deox Reagent

Seems like a big price difference for a dropper and instructions..

[waterbear]

without the instructions, which are fairly extensive and the dropper, which is calibrated to dispense the correct amount, the reagent is useless. They also have a kit that comes with the 2 oz bottles of reagent that goes for about $35 and a kit that combines the FAS-DPD test with the monopersulfate interference remover for around $100.

https://www.taylortechnologies.com/en/product/test-kits/reagent-packmonopersulfate-interference-remover-for-2000-series-kits-w-75oz-rea--K-2041

https://www.taylortechnologies.com/en/uproduct/reagent-pack-monopersulfate-interference-remover-for-2000-series-kits-w-2-oz-re?id=K-2042

https://www.taylortechnologies.com/en/product/test-kits/drop-test-chlorine-freecombinedmonopersulfate-fas-dpd-1-drop-02-ppm--K-1518

[waterbear]

As far as using MPS, unless you have PERSISTANT combined chlorine OVER 1 ppm I would not mess with MPS and before I did I would leave the spa uncovered and exposed to sunlight for a few hours since UV helps break down CC. IF your spa is indoor or does not get enough sunlight then you might have to resort to MPS much like indoor swimming pools do.

[rmcderm313]

7 hours ago, waterbear said:

without the instructions, which are fairly extensive and the dropper, which is calibrated to dispense the correct amount, the reagent is useless. They also have a kit that comes with the 2 oz bottles of reagent that goes for about $35 and a kit that combines the FAS-DPD test with the monopersulfate interference remover for around $100.

https://www.taylortechnologies.com/en/product/test-kits/reagent-packmonopersulfate-interference-remover-for-2000-series-kits-w-75oz-rea--K-2041

https://www.taylortechnologies.com/en/uproduct/reagent-pack-monopersulfate-interference-remover-for-2000-series-kits-w-2-oz-re?id=K-2042

https://www.taylortechnologies.com/en/product/test-kits/drop-test-chlorine-freecombinedmonopersulfate-fas-dpd-1-drop-02-ppm--K-1518

@waterbearThank you for the response.  I didn't realize how precise the process might be.  I use the Taylor 2006 so I would be looking at the add-on.  Based on your other response, I might just hold off on MPS unless a need arises.

Rob

[rmcderm313]

7 hours ago, waterbear said:

As far as using MPS, unless you have PERSISTANT combined chlorine OVER 1 ppm I would not mess with MPS and before I did I would leave the spa uncovered and exposed to sunlight for a few hours since UV helps break down CC. IF your spa is indoor or does not get enough sunlight then you might have to resort to MPS much like indoor swimming pools do.

@waterbearMy spa is indoors, so no sunlight.  Since taking up the bleach/dichlor method, my numbers have all been good including CC, but I had an equipment failure soon after switching to this method, so I've only really had a few weeks of experience with it.  I'll try and stick with bleach only (after 30ppm CYA) and see if CC ever becomes an issue. Thanks for the help!

Rob