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Thread: Why does this forum recommend FC higher than what is recommended on testing kits?

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    Why does this forum recommend FC higher than what is recommended on testing kits?

    Typically, the test strip and cheaper chlorine tests recommend a range of 1 to 3 for all pools. In fact, anything above that point is considered high and out-of-range. Why do folks on this forum recommend a much higher level and in the 4 to 5 range for SWG pools?
    24,500 Gallon (640 SF) Inground Gunite Salt Water Pool w/ Diamond Brite Midnight Blue Plaster. Pentair IC 40 Chlorine Generating System. Hayward 60 DE Filter. Jandy Aqualink Remote System. Polaris 360 Automatic Pool Cleaner. 50 SF Spa with waterfall feature
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    Mod Squad tim5055's Avatar
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    Re: Why does this forum recommend FC higher than what is recommended on testing kits?

    Because the industry recommendations of 1 to 3 fail to take into account the effects of CYA/Stabilizer on chlorine.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Mod Squad kimkats's Avatar
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    Re: Why does this forum recommend FC higher than what is recommended on testing kits?

    Science. There has been a LOT to science put to use to find the levels used here. If you read the deeper end you will find all kinds to posts about the hows and why.

    I do KNOW that the levels work! My pool has been clear since the day I put it up and added water due to TFP levels.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Patrick_B's Avatar
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    Re: Why does this forum recommend FC higher than what is recommended on testing kits?

    It's also because of federal EPA regulations. They too fail and refuse to recognize Cya chlorine relationships, hence the suggested levels from all those in the industry.
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    Richard320's Avatar
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    Re: Why does this forum recommend FC higher than what is recommended on testing kits?

    Because it works. Here's the scientific stuff Pool Water Chemistry
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: Why does this forum recommend FC higher than what is recommended on testing kits?

    See also the "Chlorine/CYA Relationship" section of the thread Certified Pool Operator (CPO) training -- What is not taught.

    Because of FIFRA regulations the EPA enforces regarding pesticide product labeling, they will not allow any pesticide product to specify a higher dosed FC level than the 4 ppm that is the limit in EPA Drinking Water Contaminants standards. Nevertheless, commercial/public pools are regulated by state (and sometimes county) codes as with 5 ppm in New York (see 6.11(c)(1) and also note (4) which bans use of CYA), 8 ppm in Texas (see table on last page), and 10 ppm in Florida (see 64E-9.004(1)(d)(2)) that all exceed EPA limits.

    The active chlorine (hypochlorous acid) level in pools at the recommended minimum FC for non-SWCG pools where the FC is roughly 7.5% of the CYA level is equivalent to a pool with only 0.06 ppm FC and no CYA. So comparing a pool with CYA to one without is like comparing apples and oranges. The way to look at it is that pools or spas with no CYA are usually hugely over-chlorinated because they have no CYA to moderate chlorine's strength. The effects are noticeable on swimsuits, skin, and hair.
    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
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    Re: Why does this forum recommend FC higher than what is recommended on testing kits?

    Thanks for the information.
    24,500 Gallon (640 SF) Inground Gunite Salt Water Pool w/ Diamond Brite Midnight Blue Plaster. Pentair IC 40 Chlorine Generating System. Hayward 60 DE Filter. Jandy Aqualink Remote System. Polaris 360 Automatic Pool Cleaner. 50 SF Spa with waterfall feature
    Hayward 440,000 BTU Heater. Two Colorlogic LED pool lights.

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