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Thread: Whats your FC loss with your pool covers?

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    Join Date
    Apr 2009
    Location
    Western Kentucky
    Posts
    31

    Whats your FC loss with your pool covers?

    For those who have a pool cover, I'm curious what your FC loss per day is?

    I've put a clear pool cover over my pool, mainly to prevent evaporation and FC loss. But I still have quite a bit of FC loss per day.

    Before I installed the pool cover, I was loosing 4 ppm of FC every day. Now with the cover installed, I'm losing 3 ppm of FC every day. I was hoping for better results then that.

    I know nothing is eating up the chlorine, as I've done an overnight hold test, and only dropped .5 ppm.

    Here is my complete test results.

    FC 6 (Before adding bleach. I try to keep between 8-10 ppm)
    CC 0
    PH 7.5
    TA 75
    CH 150
    CYA 45
    TEMP 92.5F
    32'x16' vinyl in-ground. 8' Deep, 3' Shallow
    Est. 21,000 gallons
    Hayward 300lb Sand filter w/SP-0714T valve assembly.
    Hayward 1 1/2HP Super Pump swapped with a A.O. Smith Dual Speed Motor.
    1 Skim, 1 Drain, 2 Outlets

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    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,963

    Re: Whats your FC loss with your pool covers?

    I just got a new cover in June, dark blue/black. The first two days the cover was on 24/7 and I lost 0 FC. I was stunned. I went on vacation for 10 days, shocked the night before I left to 16 came home and FC was 8...
    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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    Join Date
    Apr 2009
    Location
    Western Kentucky
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    Re: Whats your FC loss with your pool covers?

    Quote Originally Posted by frustratedpoolmom
    I just got a new cover in June, dark blue/black. The first two days the cover was on 24/7 and I lost 0 FC. I was stunned. I went on vacation for 10 days, shocked the night before I left to 16 came home and FC was 8...
    Interesting, I'm wondering if mine being clear is allowing more UV to get into the pool, burning off the FC?
    32'x16' vinyl in-ground. 8' Deep, 3' Shallow
    Est. 21,000 gallons
    Hayward 300lb Sand filter w/SP-0714T valve assembly.
    Hayward 1 1/2HP Super Pump swapped with a A.O. Smith Dual Speed Motor.
    1 Skim, 1 Drain, 2 Outlets

  4. Back To Top    #4
    orthofish's Avatar
    Join Date
    Jan 2009
    Location
    Northern Middle Tn.
    Posts
    561

    Re: Whats your FC loss with your pool covers?

    I had asked that question some time back about the clear cover allowing sun to still eat up chlorine. Seems you have answered it.
    Lynn

    16x38 FG, 20,400G, 1HP/2sp Tristar pump, Hayward 425sq ft cart. filter, Pro Logic4, SWCG, 3 returns, 2 main drains, 1 skimmer, 4 Pentair deck jets, Hayward Phantom pressure cleaner/booster pump, TF-100 of course :-)orthofish-s-pool-build-finally-t13179.html

  5. Back To Top    #5

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,085

    Re: Whats your FC loss with your pool covers?

    My electric safety cover is mostly opaque (tan) and I lose about 1 ppm FC per day with 1-2 hour per day pool use, but even without use the loss is around 0.8 ppm FC per day or thereabouts. The pool is usually at higher temps at 86-90F.

    It would seem that the clear cover isn't blocking UV very much. That's disappointing since one wants the light to come through for heating, but wants to block the UV to lower the chlorine usage.
    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"

  6. Back To Top    #6

    Join Date
    Apr 2009
    Location
    Western Kentucky
    Posts
    31

    Re: Whats your FC loss with your pool covers?

    Well guess this confirms that if you want low FC loss, go with a colored cover.

    If you want hot water, go for the clear. Mine hit 94 degrees today! A little to warm for me. I've pulled it off to cool it down a little.

    Wish I would have know this, as I would rather have the low FC loss over boiling water.

    Lesson's that we learn
    32'x16' vinyl in-ground. 8' Deep, 3' Shallow
    Est. 21,000 gallons
    Hayward 300lb Sand filter w/SP-0714T valve assembly.
    Hayward 1 1/2HP Super Pump swapped with a A.O. Smith Dual Speed Motor.
    1 Skim, 1 Drain, 2 Outlets

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