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Thread: Losing Alot of FC Each Day - Is This Normal ??

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    Losing Alot of FC Each Day - Is This Normal ??

    Hello Everybody:

    Thanks to the great advice already received from you nice folks here at TFP my new pool is clear and doing well. I do have one question though as I do not yet have the experience to know what is the norm. Now that my CYA level is stable and present I am finding that I lose an FC value of about 5-7 every day. My current target FC level is 4.

    The result is that each evening I use the pool calculator to overshoot my target level of 4 to about 7 or 8. By the next evening I am typically right at my minimum of 2.

    I did the overnight FC loss test about 1 week ago and was OK with a drop of 1FC and a CC of .5. I haven't tested the CC level since then, but have kept the FC level above 2. As mentioned, the pool is clear and looks good.

    My latest readings are:

    CYA 30
    FC 7 (this morning)
    PH 7.5
    TA 220
    TH 230
    Temp: 85

    For my pool size I need to add 10 ounces of 6% chlorine to raise the FC by a factor of 1. The result, adding about 50-70 ounces each night. This seems like alot. Maybe I am naive. What are your thoughts ??

    Thanks!

    Jim
    18'x 52" Intex Ultra Frame AG pool
    7100 gallons
    1600 Intex sand filter
    TF-100 test kit
    BBB method for four seasons
    Former 18' Easy Set owner

  2. Back To Top    #2
    Mod Squad JohnT's Avatar
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    Re: Losing Alot of FC Each Day - Is This Normal ??

    I'd move the CYA up to 40ppm.
    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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    frustratedpoolmom's Avatar
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    Re: Losing Alot of FC Each Day - Is This Normal ??

    I agree, try a higher CYA level, you should be able to get to a 2-3 ppm loss with a CYA of 40-50.
    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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    Mod Squad Bama Rambler's Avatar
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    Re: Losing Alot of FC Each Day - Is This Normal ??

    I was losing 4 to 5 a day until I bumped my CYA up to 50. Now I'm losing 2 to 2.5 a day. I'm adding an average of 40oz of bleach a day.

    I agree with John & FPM. Bump your CYA up to 40 and see what happens. If that's not enough bump it on up to 50.
    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

  5. Back To Top    #5

    Join Date
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    Re: Losing Alot of FC Each Day - Is This Normal ??

    OK will do. I'll pick up another 1# bag of Dichlor and dissolve it in over 2-3 nights.

    Thanks for your advice!

    Jim
    18'x 52" Intex Ultra Frame AG pool
    7100 gallons
    1600 Intex sand filter
    TF-100 test kit
    BBB method for four seasons
    Former 18' Easy Set owner

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