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Thread: CYA and backwashing

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    Join Date
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    CYA and backwashing

    Just opened the pool about a week ago and with a little TLC got it back to blue and clear. I took a sample to my local pool guy and as I
    figured some of my numbers need a little tweeking, as expected. My question is with my CYA a little low (55ppm) and the fact that it is
    SNOWING POLLEN , I literally have to backwash once a day. I know this because I've done it the past 4 days and the water that comes out
    is nasty. How can I add stabilizer if your not supposed to backwash for a week after adding it?
    16x34 kidney shape 19,000 gal vinyl IG
    Pentair IC-20 SWG
    Pentair sand filter
    Pentair 1HP pump

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    duraleigh's Avatar
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    Re: CYA and backwashing

    Tie it up in an old sock and suspend the sock in front of a return.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: CYA and backwashing

    What should I tie up?
    16x34 kidney shape 19,000 gal vinyl IG
    Pentair IC-20 SWG
    Pentair sand filter
    Pentair 1HP pump

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    Mod Squad zea3's Avatar
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    Re: CYA and backwashing

    Put the stabilizer in an old sock and tie it so it hangs in front of where the water returns to the pool from the pump. It will take several days to dissolve. You will also need to wait about a week after adding stabilizer for it to be reflected accurately in the test results.
    TFP Moderator
    Helpful links: TF Test Kits,TFP Pool School, PoolMath
    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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    frustratedpoolmom's Avatar
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    Re: CYA and backwashing

    Yes, you read correctly. A sock. like an old tube sock or dress sock. Pour in the granules, tie a knot at the top, and use some string to hang the sock in front of the return. the flow of the water will make the granules dissolve and you won't lose any to backwashing.
    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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    stev32k's Avatar
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    Re: CYA and backwashing

    I use one of my wife's knee-high nylon socks. They will expand enough to hold just about any amount you need. Then tie a knot in the top and drop it in the skimmer.
    20' x 40' IG with vinyl liner volume approx. 35,000 gal.1.5 H.P. main pump, Polaris 280 cleaner W/ 3/4 H.P. booster pump
    Hayward sand filter, 3.14 sq ft, 62 gpm. Stenner 45 MPH10 chlorine feed pump. 1 micron final filter bags (home made and very effective)

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    Mod Squad Bama Rambler's Avatar
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    Re: CYA and backwashing

    The only issue with putting it in the skimmer, with him backwashing so often is that he'll backwash a lot of the partially dissolved out. In this case it's better to hang it in front of a return then he only loses a little during backwash.
    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

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