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Thread: Aiming for the target FC

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    JohnA902's Avatar
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    Aiming for the target FC

    Following the TFPC method, assuming the CYA is accurate, let's say the CYA FC ratio says the target FC is 5ppm. Is it bad to aim for 6ppm? Today I lost 3ppm of chlorine. 0 CC.

    Target says 5ppm, I just added bleach to 6ppm, assuming tomorrow it will drop another three so at least I'm near the target for the most of the day tomorrow.

    Anything wrong with with that line of thought?

    John
    27,000 gal concrete rectangle, built Oct '15, DE filter, Jandy PHPM 1.5 HP, Hayward HP21104T heat pump, TF-100

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    Richard320's Avatar
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    Re: Aiming for the target FC

    I think you've mastered the theory of FC range.

    You target high enough to keep you above minimum until you next replenish. So if you're losing 3 every day and minimum is 3, you target 6.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    JoyfulNoise's Avatar
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    Re: Aiming for the target FC

    The FC/CYA ratio establishes a MINIMUM, or floor value below which you should not let your water sit for any long period of time. The FC/CYA ratio for manual bleach chlorination is 7.5%. For SWG pools, it's 5%.

    You need to add enough chlorine each day to stay above this minimum value.
    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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    Mod Squad pooldv's Avatar
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    Re: Aiming for the target FC

    Nope, you've got it. And aim for 7 or 8 if you have a bunch of people swimming. It is safe to swim with FC above minimum and up to shock level for your CYA. Chlorine CYA Chart. Yes, we swam for two weeks last summer with CYA at 70 and FC at 28. Nobody even noticed.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    JohnA902's Avatar
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    Re: Aiming for the target FC

    Nice. Thanks!
    27,000 gal concrete rectangle, built Oct '15, DE filter, Jandy PHPM 1.5 HP, Hayward HP21104T heat pump, TF-100

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