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Thread: First accurate tests - high CYA and CH

  1. Back To Top    #1

    Join Date
    Dec 2013
    Temecula - Southern California

    First accurate tests - high CYA and CH

    Finally received my K-2006 test kit. The first test reasults are:

    FC: 2.5 ppm
    CC: 0
    pH: 7.5
    TA: 200 ppm
    CH: 950 ppm
    CYA: not sure about 1/3 of the way from the bottom of the tube to the 100 ppm mark (I was careful with judging the black dot, and repeated the reading)

    So my understanding is that the only solution is drain and refil. The area in which I live has a "pool can be filled once every 5 years" limit, and having just moved into the house, I don't know when it was last refilled.

    The questions:
    1) What should I do maintain the pool until I can either refill or have RO treatment?
    2) When should I do the refill if I can do so?
    3) If I can't refill, I will see if the RO people in San Diego will come up here. If I need to take this option, when is the best time to do this?
    4) Any alternative solutions?

    Thank you
    20k gal, IG gunnite plaster + spa, 2 HP Whisperflo pump, Pentair 520 sq ft catridge filter
    Pentair Min Max NT heater. Intelli-touch i5 controller, Ultrapure ozone (currently disabled), Rainbow 320 chlorinator
    Small water feature, Water slide. Poolvergnuegen 2WD suction cleaner.

  2. Back To Top    #2
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana

    Re: First accurate tests - high CYA and CH

    Your two issues are your CH and CYA, both of which are best fixed by replacing water.

    To deal with the CH, you'll want to keep your pH toward the low end of the range to avoid scaling.

    For the CYA, you won't have any real issues as long as you keep a handle on your pool. Your normal FC level will be much higher than normal, but your chlorine consumption from sun light will be much lower than normal. The issue blows up if you have an algae bloom because the shock levels needed are very high. Check out The Chlorine/CYA Chart for the levels you need.

    Measure the CH of your tap water to get an idea of the best option for proceeding. You may be able to drain a few inches of water and replace it over time to reach more appropriate levels
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  3. Back To Top    #3
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Elverson Pa.

    First accurate tests - high CYA and CH

    For the cya test you can use half tap water half pool water. Then multiply that reading X 2 for your CYA level. A pool with a CYA level of 100 or more is not going to be easy to maintain for long.
    Also your FC level is way low. pool-school/chlorine_cya_chart_shock

    I would start replacing pool water as soon as you can or the RO.
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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