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Thread: Where do i set my ph etc...

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    Join Date
    Sep 2015
    Location
    Phoenix, AZ
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    17

    Where do i set my ph etc...

    I just bought this house, now just trying to get pool in line. Just did drain and refill because of cya through the roof, and did a acid and bleach wash. Now its filled up and running for week, and tabs in a floater, until I add cya. I have my stenner ready to put online. Here is my first test results.
    FC .5
    CYA 0
    CC 0
    CH 225
    TA 150
    Ph 8.2
    Tc .5

    Being in az, water is hard, so the TA and CH will drift higher I assume. Were to I set my ph to prevent scaling?
    IG Gunite play pool 15k gallon 20' x 30' , System:3 cartridge filter S8M150, Stenner pump, Fiber optic lights 3 head with color wheel, TF-100 Testkit, CYA-50, FC-6, CH-375, TA-40, PH-7.8

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    Texas Splash's Avatar
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    Jun 2014
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    South-Central Texas, Marion/San Antonio
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    Re: Where do i set my ph etc...

    Bring pH down to 7.5-7.6 range. Never let it go over 7.8. TA is high with new water but will eventually come down over time - ideally around 60-80 ppm. Not the most important right now though. No SWG? Then shoot for an initial CYA target of 30-50 ppm and adjust FC to match as noted on the Chlorine/CYA chart (between 4-6 ppm). Use regular bleach to increase FC quickly to avoid cloudiness and algae bloom. Hope that helps.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Richard320's Avatar
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    Jan 2010
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    San Dimas, CA (LA County)
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    18,768

    Re: Where do i set my ph etc...

    With the high TA you show, pH will rise quickly. The way to slow it down is to lower the TA. There's an article in pool school on how to do it, but that's probably not necessary. Just target 7.2 pH each time the pH gets close to 7.8. pH rise will slow, TA will go down, and at some point you'll find the sweet spot where your pool chemistry stays pretty stable for a week or more at a atime.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Mod Squad pooldv's Avatar
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    Aug 2012
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    DFW, TX
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    23,994

    Re: Where do i set my ph etc...

    To prevent scale monitor your CSI score in Poolmath. After you enter your test results it will automatically calculate it for you. Tweak PH and TA if needed to see what the impact will be to your CSI, be sure to enter water temp. Keep your CSI in the recommended range. I like to keep mine slightly negative for best results, -0.1 to -0.2.
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