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Thread: Second Water Test - AGP

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    Join Date
    Jul 2011
    Location
    West Monroe, La
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    Second Water Test - AGP

    Hey Gang

    I have been reading up on the BBB method and all the information on this site - I have a TF test kit on the way, in the mean time I have taken a sample to a local (reputable) pool store.

    Saturation index - 0.4 (little high because pH is also high)
    CYA - 86
    TC - 2.3
    FC - 2.3
    pH - 8.1
    TA - 150
    TA adjusted - 124
    Hardness - 78
    Salt - 3100ppm

    I was reading when using an SWG that if my CYA is 80, my target FC should be 6 - when I talked to my installer after the sample he recommended that I add about 1/3 gallon muriatic acid to lower the pH. Does my FC level need to go up and or my CYA come down?

    I have approximately 17100 gallons in the pool, my SWG is on 100%, 24hrs/day - it is an Aqua Trol RJ unit.

    Any input from you other BBB members to help me get started...

    Thanks
    Clint
    27'x54" Matrix Resin - 200lb Pentair sand filter - 1.5hp Pentair optiflow 2 speed pump - Aquatrol SWG - Gorilla Pad

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    Join Date
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    St. Paul, MN
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    Re: Second Water Test - AGP

    Can you describe how your water looks? Is it clear, cloudy, green, etc...?

    For now, you should lower your pH to around 7.5 using muriatic acid. Use the pool calculator to calcalute how much to add (I get 38 oz.). Once you get your own test kit, you will want to lower your TA - follow this link on how to lower TA pool-school/lowering%20total%20alkalinity

    You should use bleach to bring your FC up to 6. If you SWCG is not keeping up with your pools chlorine demand, you may have algae which is eating all your chlorine, or you may have something wrong with your SWCG.
    20'x40' Oval 27,000 gallon Vinyl IG, Coverstar Auto Cover
    Hayward MaxFlo SP2303VSP, Sta-Rite PLD50 30 sq. ft. DE filter
    Rheem 266,000 btu natural gas heater
    Dolphin Nautilus Plus with Clever Clean
    TF-100 testkit w/ Speed Stir

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    Sebring, Florida
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    Re: Second Water Test - AGP

    Does my FC level need to go up and or my CYA come down?
    Mostly, bring your FC up. I suggest you not trust the pool store result for CYA until your kit arrives. Post your own numbers and things may well change.

    As posted above, lower your pH. The pool stores usually get that one pretty close to correct.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Join Date
    Jul 2011
    Location
    West Monroe, La
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    Re: Second Water Test - AGP

    Pool water is very clear - we have only been running everything for about a week now.

    From what I have read in reducing TA, since my pH is also high, that muriatic acid will reduce both pH and TA, is that correct?

    Both my SWG manual and the pool place recommend 1-3 for FC - should I be using more like 3-5 for FC as it shows in the pool school?
    27'x54" Matrix Resin - 200lb Pentair sand filter - 1.5hp Pentair optiflow 2 speed pump - Aquatrol SWG - Gorilla Pad

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    Join Date
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    Boston, MA
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    Re: Second Water Test - AGP

    Yes, MA reduces both pH and TA. But it reduces pH a lot more, so you generally use several pH cycles to bring the TA down appreciably. (Add acid to bring it down, TA brings it back up, repeat but the TA's a bit lower this time around.)

    Industry recommendations don't take into account the effect of CYA on your FC effectiveness. This is why they're lower than Pool School calls for, and also why they're so prone to causing algae blooms.
    20k gallon IGP
    Plaster over gunite
    3/4 hp Hayward pump
    Purex Triton DE filter
    TF100 test kit w/ speedstir

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