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Thread: Opening numbers

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    Opening numbers

    (Update: Edited TA numbers below because I reran TA and got a better reading. No longer 130 but 90-100.)

    Opened yesterday and had a non-operable pump. Replaced it and now working. Pool has been running for about an hour and here are our numbers:

    CYA: 0
    FC: 3
    PH: 7.2
    TA: 90-100

    Didn't test CH as that doesn't appear to be an issue for vinyl...(right???)

    So my first step is to tackle CYA and raise to 30.

    1. Do you suggest any other goals at this point? PH is a little low but I'm assuming PH will go up on its own overtime but I may need to work on TA.

    2. I always do a SLaM when opening and an overnight chlorine test but don't I first have to wait for CYA to reach measurable levels?
    25,000 gal
    Sand filter
    1 horsepower pump (don't know flow rate)
    14 years

  2. Back To Top    #2

    TFP Guide

    bmoreswim's Avatar
    Join Date
    Jul 2012
    Central MD

    Re: Opening numbers

    You can being the SLAM immediately after adding the CYA. Don't test for it just yet, just assume it's there at the level you added it for. You can test for it in a few days. pH is close enough, don't adjust.

    Happy SLAMming!!
    18'x38' Rectangle (3'-8 1/2' deep w/ diving board) - 27K gal. w/ gray plaster
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  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Opening numbers

    Low CH is not a problem for vinyl. High CH can still risk scaling. You should test it even if you never add any.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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