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Thread: Pool beautiful and sparkly but CYA 100+

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    Join Date
    Aug 2011
    Location
    Central Valley California
    Posts
    121

    Pool beautiful and sparkly but CYA 100+

    Thanks for the info on this sight. The pool has never looked better. Switched from the pucks to liquid chlorine back in April. All I use now is liquid chlorine daily and muriatic acid weekly. Would there be any reason to drain out some water to get the CYA down? It likes to stay over 100. Thanks.
    23,000 gal IG Plaster 1989
    Purex Triton FNS Plus DE Filter Model FSNP 60
    1 Hp pump, Polaris 380 w/booster pump
    700 Gal Spa
    Laars Lite Heater T-F 100 Test Kit

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    Re: Pool beautiful and sparkly but CYA 100+

    It is possible but not easy to manage a pool with that sort of CYA level. We don't recommend it. CYA will ever so slowly decline on its own, plus excessive rains can dilute it if that causes the pool to overflow. The normal water loss due to backwashing and the refill needed after that will slowly allow CYA to decline.

    Are you on water restrictions? If you can manage it, a partial drain and refill is best. If you do it all at once you waste less water however the backwashing of the filter will happen regardless. It is a choice, can you stay on top of this really well for a year or more? It probably will take that long for the CYA to decline on it's own. Any slip up, you get sick, go on vacation, big storm that knocks out power or adds debris to the pool will lead to algae which is a bear to fight at CYA of 100+.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Pool beautiful and sparkly but CYA 100+

    It can be done, because I've done it, but it's not something I recommend, either. You're treading a very thin line, because if you let FC slip and get algae, you'll be forced to drain or buy bleach by the barrel. Minimum FC should be 8 or above, so a regular test kit is useless. You have to use the FAS-DPD test to be accurate, so I hope you have plenty of refills waiting.

    I understand the reluctance to waste water. So do what I do: use pool water on the lawn, then refill the pool. I move valves around and empty the spa into the pool, then refill the spa from the hose while using pool water on the lawn. And then set everything back to normal and it mixes fine. In my case, a spa-load of water plus another inch or two from the pool will water all the lawns quite well. And replace about 5% of the water each time.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  4. Back To Top    #4

    Re: Pool beautiful and sparkly but CYA 100+

    Oh, that is clever Richard, to use the spa that way.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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