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Thread: CYA/FC chart

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    DSdiver's Avatar
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    CYA/FC chart

    Which chart should a person use there is 2 of them one older is the new one better? It seems my FC should be higher with the new one. Or is either ok to use?
    20x40 IG vinyl lined 34,100 gallon/Hayward filter EcoStar model SP 3400 VSP/Hayward filter(sand) model S310T2 flow rate 98GPM/RayPack gas heater model 266 266,000BTU/Aqua Plus Automation and chlorination with Hayward Turbo Cell T-Cell-15/Hayward universal color logic light/ Delta UV filter/4 return lines 2 skimmers and dual main drains/Auto cover/ Pool is 3 years old. TFT test kit XL speedstir.

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    mas985's Avatar
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    Re: CYA/FC chart

    Are you talking about this chart: Pool School - Chlorine / CYA Chart

    One is for a pool without an SWG and one is for a pool with an SWG.
    Mark
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    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Scuba_Steve's Avatar
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    Re: CYA/FC chart

    This one:

    Chlorine/CYA Chart
    6425g Intex Ultraframe 18'x48" AG
    Stock 1500gph cartridge filter / Intex SWG CG-28669 with E.C.O.
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    DSdiver's Avatar
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    Re: CYA/FC chart

    Steve thanks,
    What is the other one about it looks like it requires you to keep your FC higher then the one you posted.

    - - - Updated - - -

    http://www.troublefreepool.com/threads/2177-Chlorine-CYA-Chart This one is the other I was referring to.
    20x40 IG vinyl lined 34,100 gallon/Hayward filter EcoStar model SP 3400 VSP/Hayward filter(sand) model S310T2 flow rate 98GPM/RayPack gas heater model 266 266,000BTU/Aqua Plus Automation and chlorination with Hayward Turbo Cell T-Cell-15/Hayward universal color logic light/ Delta UV filter/4 return lines 2 skimmers and dual main drains/Auto cover/ Pool is 3 years old. TFT test kit XL speedstir.

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    mas985's Avatar
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    Re: CYA/FC chart

    Pool school is a rounded version of Chemgeeks to simplify it.

    Acknowledgment: The original Chlorine/CYA "Best Guess" chart was developed by Ben Powell. Richard Falk (chem geek) has refined and expanded on that original to produce the Chlorine/CYA Chart by Chem Geek based on experiences with members on this forum and the old Pool Forum and conformation to chemical theory.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Mod Squad jblizzle's Avatar
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    Re: CYA/FC chart

    The one you just posted has more decimal places ... they should round to the simplified one in Pool School.

    I guess I do not see the difference you are talking about.
    Jason, TFP Moderator
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    DSdiver's Avatar
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    Re: CYA/FC chart

    Jason,
    So on the pool school chart if you have a CYA of say 80 you MinFC is 4 and the target is 6. Then the other one has a MinFC of 5.8 and a target of 9.1 for a CYA level the same. Look I don't want to be a nut case if the one posted in pool school is good I will stay with that.
    20x40 IG vinyl lined 34,100 gallon/Hayward filter EcoStar model SP 3400 VSP/Hayward filter(sand) model S310T2 flow rate 98GPM/RayPack gas heater model 266 266,000BTU/Aqua Plus Automation and chlorination with Hayward Turbo Cell T-Cell-15/Hayward universal color logic light/ Delta UV filter/4 return lines 2 skimmers and dual main drains/Auto cover/ Pool is 3 years old. TFT test kit XL speedstir.

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    Texas Splash's Avatar
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    Re: CYA/FC chart

    I just compared the 2 charts and they appear to coincide. Chemgeek's detailed chart was simply rounded-up or down for the more common chart (non-SWG) we use.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    DSdiver's Avatar
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    Re: CYA/FC chart

    Ok thanks sorry for the confusion on my part
    20x40 IG vinyl lined 34,100 gallon/Hayward filter EcoStar model SP 3400 VSP/Hayward filter(sand) model S310T2 flow rate 98GPM/RayPack gas heater model 266 266,000BTU/Aqua Plus Automation and chlorination with Hayward Turbo Cell T-Cell-15/Hayward universal color logic light/ Delta UV filter/4 return lines 2 skimmers and dual main drains/Auto cover/ Pool is 3 years old. TFT test kit XL speedstir.

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    Texas Splash's Avatar
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    Re: CYA/FC chart

    Perhaps that's where the confusion is ... Non-SWG chart versus the SWG below it.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Re: CYA/FC chart

    The chart I made has non-SWG values. I refer to SWG values in the later text in terms of a percentage (4.5% of the CYA level) but I don't show a chart for it whereas the Pool School SWG chart rounds to roughly 5% of the CYA level.
    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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    DSdiver's Avatar
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    Re: CYA/FC chart

    Yes! I see this now. Once again thanks for getting me straight I had never seen the link before and I didn't realize what I was looking at. My pool water has become kind of an obsession and I love to tweak it to all of the recommended levels you guys have so when I got confused I had to ask.
    20x40 IG vinyl lined 34,100 gallon/Hayward filter EcoStar model SP 3400 VSP/Hayward filter(sand) model S310T2 flow rate 98GPM/RayPack gas heater model 266 266,000BTU/Aqua Plus Automation and chlorination with Hayward Turbo Cell T-Cell-15/Hayward universal color logic light/ Delta UV filter/4 return lines 2 skimmers and dual main drains/Auto cover/ Pool is 3 years old. TFT test kit XL speedstir.

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