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Thread: What is a normal ppm FC drop in a pool with my readings?

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    Join Date
    Jun 2016
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    Western Connecticut
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    What is a normal ppm FC drop in a pool with my readings?

    Hi. Yesterday my FC was at 10 ppm (my CYA is high at 90). CC is zero. The CYA/FC chart on this site said to keep my FC at 10. I've been doing so with liquid bleach ($2.97 for 121 oz. of 8.25% at Walmart!).

    Today, I tested again. FC was a 9 ppm. CC is zero. Therefore, in one day, I lost 1 ppm.

    Is this a "normal" FC drop from one day to the next? Also, I am new to all of this, so is the FC just naturally "burning off", or is there some organism eating the FC (don't laugh, please).

    Thanks.
    32,500 gallon in ground Gunite/White Plaster, Pentair Cartridge Filter, Pentair Propane Heater, Pentair Racer robot cleaner

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    Mod Squad YippeeSkippy's Avatar
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    Re: What is a normal ppm FC drop in a pool with my readings?

    Yes, you can easily expect to lose 1-2ppm a day to the sun, even with your high CYA.

    If you are unsure if there is something in the water consuming your FC, you can perform an Overnight Chlorine Loss Test--> Overnight Chlorine Loss Test

    Yip
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
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    JamieP's Avatar
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    Re: What is a normal ppm FC drop in a pool with my readings?

    That sounds like a great amount to lose to me! I'm losing over 3.5 ppm a day here south of Dallas. Remember, even in a perfectly clean pool with no swimmers, FC will be burned off by the sun (on cloudy days too.) So it sounds like you're doing fine to me.
    28,000 gallon freeform, Stonescapes Tropics Blue Minipebble with abalone, 3.5' to 8.5' depth. 2 skimmers, 5 returns, dedicated vacuum port, Dolphin Z5 robot. All Pentair equip: EasyTouch 8, IC60 SWG, VS pump, 520 Cartridge Filter, 3 Intellibrites, 2 Color Cascade Bubblers. TurboTwister Slide and 8' Salt System Jump Board. TF-100. My Jan-Mar 2016 build:
    Waxahachie, TX Owner Build - A race to beat the baby!!

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    chayne's Avatar
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    Re: What is a normal ppm FC drop in a pool with my readings?

    i usually have to add half of a gallon of liquid chlorine 10.25% every other day to my pool. we are having over 100 degrees days for the last 6 days straight here by the red river. i even half to add about 2-3 inches of water every 3-4 days. the sun and heat just eating it all up.
    Charles
    Coleman 16'x48"
    Intex 2100 GPH pump & Sand filter, Intex Robot Vacuum
    Hayward Wide Mouth Skimmer
    TF-100 Test Kit Magnetic Speed Stirer

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    Chasmengr's Avatar
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    Re: What is a normal ppm FC drop in a pool with my readings?

    My chlorine loss is about 3ppm/day with CYA ~30+.
    Chas & Cheryl (first-time, second-year pool owners)
    Radiant Metric Oval AGP 16'x32'x52"; Pentair: Clean&Clear 150 Cartridge, OptiFlo 1.5 Hp 2-spd, and 320C Feeder (all mounted below water level); Taylor K-2006 & SpeedStir; Maytronics Dolphin E10 (aka Einstein)
    installation pics (2015-2016)

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