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Thread: High Phosphate in Salt Water Pool

  1. #1
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    Default High Phosphate in Salt Water Pool

    I just got back from the pool store to check my water chemistry and I was told my phosphate level is too high at 2500 ppb. I never had this problem before. Do I need to lower the phosphate level and to what level and with what. I have a watermaid salt chlorinator. The water is crystal clear an there is no algee in the pool, the chemistry is:
    FC-3.0
    TC-5.0
    CC-2.0
    PH-8.0
    Hardness-250
    Alkalinity-150
    Cyanuric-60
    Copper-0
    Iron-0
    TDS-5000
    Phosphate-2500
    Salt-6000
    Water Temp-86F

    Thanks for your help

  2. #2
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    waterbear is offline Lifetime Member Sniggle Mechanic waterbear 4 stars waterbear 4 stars waterbear 4 stars waterbear 4 stars
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    Default Re: High Phosphate in Saly Water Pool

    I would not worry about the phosphate at all. It is a non-issue and you don't have any problems now either, BUT the CC of 2 ppm and the pH of 8 is troublesome.
    First, shock the pool with bleach or liquid chlorine to about 20 ppm a to get rid of the CC (since you did not say how big your pools is I can't tell you how much to put in but a good rule of thumb is that one gallon of bleach or liquid chlorine wil raise the FC in 10,000 gallons by approx. the strength of the chlorine (i.e. a gallon of 6% bleach will raise it 6 ppm and a gallong of 12.5% pool chlorine will raise it about 12.5 ppm.) It might take more than one shocking, depending on the source of the CC.
    I would also add some acid to get the pH below 7.8.
    Once you get the CC to 0 ppm you can work on the pH stabilty.
    Bringing your CYA up a bit to around 80 ppm and setting the SWCG to maintain a 4-5 ppm FC is the first thing I would recommend
    Then getting your TA down to about 70 ppm to minimize the pH rise from outgassing of CO2. (If you have a plaster pool you will need to bring the calcium hardness up a bit to keep the water balanced...around 350 to 450 ppm.
    Retired pool store and commercial pool maintenance guy.

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