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Thread: Can't get the CYA down

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    Can't get the CYA down

    Last summer I battled all season with high CYA. It was always between 100-120 so I had to buy a lot of chlorine for maintenance. At the end of last season I drained a good amount of water from my 22000 gallon pool.

    This weekend I opened the pool for the first time and added probably about 1/3 of well water back into the pool. I thought this would help lower my CYA but when I measured it today with the forum test kit it was still at 100.

    Could this be possible considering how much fresh water I added to the pool? How accurate is the test kit when it comes to CYA and if it is accurate how can I get the CYA levels down?
    22000 gallon, vinyl, 1.5HP Century Centurion Pump
    Hayward Sand Filter (no.20 silica sand)
    PoolVac Plus Automatic Cleaner

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    Join Date
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    Over 100 ppm, the tests aren't very accurate you may well have started much higher than you thought, As such, it's entirely possible to still have A LOT of cya in the water - as you know, the only solution is to partially drain the pool

    Sorry to have to tell you this, but getting the cya under control now will make for a more 'trouble free' season
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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    duraleigh's Avatar
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    Ditto what Ted just posted. It was probably higher. I'd drain 1/2 if you're not in a drought area.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4
    Thanks for the info. Unfortunately, it looks like I'm stuck with high CYA for the season again. I live in Atlanta and we're in a pretty bad drought. I'd hate to waste 10000 gallons of water just to make my life easier. Any other suggestions to lower it without wasting so much water?
    22000 gallon, vinyl, 1.5HP Century Centurion Pump
    Hayward Sand Filter (no.20 silica sand)
    PoolVac Plus Automatic Cleaner

  5. Back To Top    #5
    Mod Squad JohnT's Avatar
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    Is your water clear? Even a slight bit of cloudiness in the water can make the CYA test read high.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  6. Back To Top    #6
    Guest
    All I can suggest is to not use any form of stabilized chlorine and hope this summer is very rainy! Also, if the CYA is very high it is possible for it to deposit on the walls of the pool and in the plumbing so when you start dilutiing more CYA dissolves and you think that it didn't lower at all. I know this is frustrating but once you actually start being able to fill and drain you will eventually get it lowered. There are some products that are supposed to lower CYA but they are expensive to use and I spoke with one of the men who developed it. He said it is not really going to help if you need to lower the CYA more than about 20 ppm.

  7. Back To Top    #7
    Quote Originally Posted by JohnT
    Is your water clear? Even a slight bit of cloudiness in the water can make the CYA test read high.
    It is a bit cloudy, having just opened it yesterday. I will retest it in a week or so and see if anything changes.
    22000 gallon, vinyl, 1.5HP Century Centurion Pump
    Hayward Sand Filter (no.20 silica sand)
    PoolVac Plus Automatic Cleaner

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