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Thread: Low CH in Vinyl liner pool with fiberglass steps

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    Join Date
    Jul 2011
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    NY
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    Low CH in Vinyl liner pool with fiberglass steps

    I've been doing some quick research and have yet to come upon a definitive answer, at least as far as I can find right now.

    I've had a CH reading of 90 for the last couple of weeks and am concerned about whether or not I need to bring it up to the 200-300 range short term. I dd notice what appeared to be some metal stains on the fiberglass steps, on the vertical surface - go figure. I did read a report or two of possible metal staining.

    Does anyone here have an opin on this ? Specs in signature.

    Thanks in advance./Dave
    29,700 Gallon Vinyl Roman End, Sta-Rite Max-Therm-400HD gas heater, Sta-Rite S7M120 cartridge filter, Pool Pilot DIG-220 SWG

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    Re: Low CH in Vinyl liner pool with fiberglass steps

    I wouldn't add any CH.

    If you suspect metal staining, crush up some vitamin C tabs in a sock and hold it onto the stain for several minutes. If the stains disappears, you have metal staining but that is essentially unrelated to any CH issue.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Apr 2012
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    SW Ohio
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    Re: Low CH in Vinyl liner pool with fiberglass steps

    good advise^^^^^^^^^^
    18x52 intex ultra frame pool 6981 gallons, 1 HP LL pump with 19 in sand filter,BBB method,borax 50ppm
    leslies DPD test kit + fas-dpd chlorine test kit + borates test strips
    thru wall skimmer,hard plumbed with 2 returns 1 1/2 sch 40 pvc
    1 large fountain 1 inch sch 40 pvc,shut off ball valves on all

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    Join Date
    Jul 2011
    Location
    NY
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    Re: Low CH in Vinyl liner pool with fiberglass steps

    Thanks all !
    29,700 Gallon Vinyl Roman End, Sta-Rite Max-Therm-400HD gas heater, Sta-Rite S7M120 cartridge filter, Pool Pilot DIG-220 SWG

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