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Thread: First Professional Water Test

  1. Back To Top    #1

    Join Date
    Jan 2010
    Location
    Northern Virginia
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    282

    First Professional Water Test

    I'm a new pool owner with a SWG. We opened it last fall and didn't do anything other than brush the gunite surface before it was closed for the season. A few weeks ago, the pool company put the salt in for the first time, but they didn't add any CYA. I've since added some. I just had my results by the local pool store and this is what they told me:

    pH: 7.6
    Chlorine 3 ppm
    Alkalinity 140
    Total Dissolved Solids: 3500
    CYA: 25

    How do those numbers look? I know I have to increase my CYA. The guy at the store suggested bringing it up to 40, but I believe that's about half of what is suggested in here.

    The plaster is still curing and causing the pH to rise, so should I try to bring it down lower?

    The guy at the pool store said all the results looked good, except the CYA, but I want to know the real truth!!

    Thanks!
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

  2. Back To Top    #2
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,331

    Re: First Professional Water Test

    I'm going to go ahead and harp this just to get it out of the way. You really need your own good test kit!

    Now that's done!

    Your TA is high but in lowering the pH you'll lower the TA. However, if the pH is rising very fast you can purposefully lower the TA faster by aerating a lot to raise pH and adding more acid to lower it which lowers TA.

    Other than your CYA the rest of the numbers look good. You should add enough CYA to get to about 70 ppm.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  3. Back To Top    #3

    Join Date
    Jan 2010
    Location
    Northern Virginia
    Posts
    282

    Re: First Professional Water Test

    Thanks Bama!
    700 sq. ft./30,000 gal, gunite pool; 48 SF DE filter; 1.5 HP pump; Salt Water Generator; Solar Heat

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