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Thread: fc loss due sunlight

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    wilkj1's Avatar
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    fc loss due sunlight

    Ok its like a week to spring yea! We have been upping pool temps with heater to 85deg . The birthday pool party fri night(my 60th) was a blast. I kept the fc up to 10 all day . pool math says 6/8 w/ 50 cya . With the party going late did not check pool fri night .Saturday mornig it was 5.5 fc .5cc lots of kids swam so.... I brought fc to 10 with 1.25 gal liquid chlorine 10% then 2 times adding 32oz liquid chlorine 10% the rest of the day. This seems to be a lot of fc loss so sunday morning at 8 am i brought it up to 9.5 then let it go all day at around 8 pm it was fc5.5 .Sunday night brought it to 9 and tested monday morning 8 am it was fc 8 cc.0 prob closer to 8.5 but oclt good. I did several oclt tests the last week up to the party all good. So im thinking here at this rate losses of 4 or more fc a day with at least 1 gal. liquid chlorine to keep 6/8 fc i may be spending $3.50 or so a day even more this summer . So now real question have i missed something or will i be at $100 or more a month in chlorine. So 6 months swimming season = a lot if so ima go get swg way sooner than i thought .Thank you all in advance jimmie


    p.s. im ready for all advice even if it cost a little $ cus the casino was good to me sat night


    numbers today pool temp 80deg
    fc 8
    cc.0
    ph 7.7
    ta 110
    ch 250
    cya 50 ***** As im sitting here my new reel for the solar pool cover that comes tomorrow just came to the door . So there will be updates to this post as to what they do to help fc loss and heat loss ****
    Jimmie...28.5 k inground plaster/quartz, 36'x16' 8.5 deep end dive rock 7x10 tan ledge 10" deep ,build date 11/16 open 4/2017, pent intelipro variable...pent.booster/cleaner bot** named george ** pentair s8m150 cartridge.. intellibrite controler(first automation) so i can stop guessing what color lites are , rheem raypac heater, circupool rj-60 plus,16 mil solar cover, TF100 /speed stir /Taylor K-1766.

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    Teald024's Avatar
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    Re: fc loss due sunlight

    If this party was a fun filled weekend of adults drinking and kids having fun, then you may just be burning off some party time residuals.
    Typical FC use is between 2-4 ppm per day. Higher end during the summer and lower in the spring/fall.




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    triptyx's Avatar
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    Re: fc loss due sunlight

    The solar cover will go a LONG ways towards reducing chlorine loss due to sun, stabilizing pH, and retaining the heat you're paying so much money for.

    Make sure to take it off for a bit in the afternoon every few days to get some sunlight on the building CCs and the pool surface itself. Make sure to brush thoroughly when you take the cover off.

    Teal is right in that you may be losing chlorine right now to sun, as well as residual sunscreen and other oils left in the pool by the high bather load. Keep a close eye on it, though, 50 CYA should be plenty to avoid excessive loss due to sun, especially this early in the season.
    8,500gal plaster in-ground with attached spa, two floor drains, one skimmer. Chlorine, City Water.
    Pentair WhisperFlo 1hp Pump, MagnaTek Midcentury EPlus motor, Pentair CleanNClear 200SF Cartridge filter, Purex Triton MiniMax 250 Gas Heater, Pentair SunLite, AutoFill.
    Kreepy Krauly Cruiser, TF-100 with SpeedStir. :D

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    wilkj1's Avatar
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    Re: fc loss due sunlight

    thank you all . on top of it for sure after last years pool guys fiasco .
    Jimmie...28.5 k inground plaster/quartz, 36'x16' 8.5 deep end dive rock 7x10 tan ledge 10" deep ,build date 11/16 open 4/2017, pent intelipro variable...pent.booster/cleaner bot** named george ** pentair s8m150 cartridge.. intellibrite controler(first automation) so i can stop guessing what color lites are , rheem raypac heater, circupool rj-60 plus,16 mil solar cover, TF100 /speed stir /Taylor K-1766.

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    JoyfulNoise's Avatar
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    Re: fc loss due sunlight

    At 8ppm FC, your FC/CYA ration is 16%. That’s double what is recommended (7.5%) and so you have to expect greater FC loss simply because your FC is higher (loss is proportional to concentration). If you’re getting more sun on your pool, then I suggest you raise your CYA to 60ppm as that will reduce UV extinction a bit more. A cover will almost entirely stop the FC loss.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    wilkj1's Avatar
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    Re: fc loss due sunlight

    thanks again just checked tonight loss from fc 8 this morning to fc 6 12 hour time span solid 8 hours in the sun. That pool party must have had some effect .
    12 hrs


    MVIMG_20180312_210135.jpg
    Jimmie...28.5 k inground plaster/quartz, 36'x16' 8.5 deep end dive rock 7x10 tan ledge 10" deep ,build date 11/16 open 4/2017, pent intelipro variable...pent.booster/cleaner bot** named george ** pentair s8m150 cartridge.. intellibrite controler(first automation) so i can stop guessing what color lites are , rheem raypac heater, circupool rj-60 plus,16 mil solar cover, TF100 /speed stir /Taylor K-1766.

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