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Thread: CYA over 200+, PH below 6, TA 40, CH 350-water crystal clear

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    CYA over 200+, PH below 6, TA 40, CH 350-water crystal clear

    Last year my pool was unbelievably crystal clear and stayed that way with very little chlorine added, but the PH stayed extremely low (bright amber) not even on the scale. CYA was not on scale, black dot disappeared before getting half way to the 100 mark. I never found any information about CYA being a problem so didn't worry about it until this year when I opened the pool, really green, added phosphate free and vacuumed to waste several different times. Then I was referred to your site. Our pool is again crystal clear-beautiful. But I decided to buy the tester you recommended and the numbers are pretty much the same as last year. But now you are saying high CYA is dangerous? We have already emptied at least a third of the pool fighting the algae. Water is very expensive is our little town. What should I do and is it possible the city water is high in CYA?


    AG, Hayward sand S180T, Hayward pump 1HP, 13,500 gallons, installed 1996.
    AG, 13,500 gal., Haywood sand S180T, Haywood pump 1HP, Installed 1996.

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    Mod Squad JohnT's Avatar
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    Re: CYA over 200+, PH below 6, TA 40, CH 350-water crystal c

    High CYA isn't necessarily dangerous, but it can make dealing with algae very difficult. CYA binds with chlorine leaving less available for immediate activity.

    Your low pH is far more important. It can cause damage to your pool and equipment over time.

    CYA is only there if you add it, usually in chlorine tablets or shock.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Join Date
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    Re: CYA over 200+, PH below 6, TA 40, CH 350-water crystal c

    Welcome to TFP!
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    frustratedpoolmom's Avatar
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    May 2007
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    SWSuburban Chicago, IL
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    Re: CYA over 200+, PH below 6, TA 40, CH 350-water crystal c

    tap water, fill water, city water... etc they never have CYA.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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