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Neutralize MPS due to allergy ?


Jasiu

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We have a large salt water chlorine generating swimming pool. After a year of medical evaluation, we discovered our son has an allergic reaction to MPS (Dupont's Oxone). He breaks out in an itchy severe rash all over his body (no issue with Cl or Br). We have since stopped using Oxone.  However, with the salt water system, it regenerates and does not dissipate.  As this is a large in-ground pool, we cannot safely drain the entire pool due to structural risk of the walls (1/3 of the water must remain).  We have drained the hot tub and refilled without Oxone, and that is now fine. Is there any reagent to MPS/Oxone that can be purchased to completely neutralize it for the swimming pool? Some people mentioned using sodium or potassium hydroxide to neutralize the sulfates?  Note:  We are also using muriatic acid for pH down instead of the sodium bisulfate.

Thank you so much for your time and help to mitigate this terrible allergic reaction.

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  • 2 weeks later...

While a saltwater chlorine generator will regenerate chlorine (hypochlorous acid) from salt (chloride ions), it should not regenerate significant amounts of MPS (monopersulfate) from sulfate ions, mostly because the level of sulfate is so low so the primary reactions are generation of chlorine and of some oxygen gas.

The monopersulfate should slowly go away when it oxidizes chemicals in the water, but if you want to have it go away faster than an easy way to do that is to dechlorinate the water since that will get rid of the monopersulfate as well.  You can dechlorinate with standard sodium thiosulfate from a pool store or you can use hydrogen peroxide (such as in Baquacil Oxidizer -- careful: NOT CDX or Sanitizer).  You don't need to dechlorinate for very long -- with good circulation an hour should be sufficient -- and then you add chlorine back to prevent bacteria and algae growth.  Don't use the pool when there is no chlorine in it.

You might have monopersulfate at low or zero levels already.  The way to test for it is to use a Taylor FAS-DPD chlorine test, such as in the K-2006 or K-1515 and then get the K-2042, OR you can just get the K-8031 if you are only interested in monopersulfate and don't want an accurate chlorine test.

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