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Thread: White stains in pool

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    White stains in pool

    I made a silly mistake of not reading the instructions and added 5 Kg of a product called Refresh which is borate. What a did not realise was this product increased PH. After 2 hours checked pool and had white blochy stains where I had pured this stuff. I tried brushing which did nothing. I checked PH and it was 8.4 so I immediately poured .5 kg of acid and after about 20 minutes I noticed some of stains had lifted a bit and PH had dropped to about 8.2. I dropped another .5 kg and waited for another half hour brushed a bit more and noticed they were slowly disappearing. After 2 hours and more acid being injected by auto unit PH had dropped to about 8.0 and stains were virtually all gone. Eventaully got PH back to 7.5 and with continuous brushing they have all gone.
    Was this calicum building over the powder I dropped in pool and consequenetly trapping it creating the white stains.
    Pool size (50,000 lt /13000 gal), Concrete Plaster 2 years old
    Automatic SWG (Zodiac Pro) for chlorine and acid, Solar heated
    Taylor K-2006 test kit

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    In the Industry

    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    30,082

    Re: White stains in pool

    Was this calicum building over the powder I dropped in pool and consequenetly trapping it creating the white stains.
    Who knows? It was certainly something precipitating out of your water and calcium is one of the possibilities.....Posting a set of test results may be helpful.

    Meanwhile, you knew how to correct it so keeping your pH down is the measure that will prevent it from happening again.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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