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Thread: Is an elevated target FC/CYA ratio a bad idea?

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    rdshackleford's Avatar
    Join Date
    Jul 2015
    Coatesville, PA

    Is an elevated target FC/CYA ratio a bad idea?

    Would it be a bad idea (for me, at least) to target a higher FC/CYA ratio than is shown in the chart? My simple thinking is that if I target 15%, it would allow me an extra few days if I get too busy to test or care for the pool chems. Are there any downsides to doing this?

    29,085.1 gal inground grecian vinyl, Hayward Super Pump VS, Hayward S-240 sand filter, Dolphin Nautilus Plus (aka Agador Spartacus), Taylor K-2006 kit, nice pool brush, crappy leaf net, frogs

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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Is an elevated target FC/CYA ratio a bad idea?

    The main downsides are that you use more chlorine since more breaks down from sunlight when the FC is higher (at the same CYA level) and the rate of chlorine oxidation of swimsuits, skin, hair, pool covers, etc. will be proportionally higher though such rate is quite low to begin with due to CYA significantly moderating chlorine's strength.
    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
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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