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Thread: Calcium Hardness in Fiberglass Pool

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    Cool Calcium Hardness in Fiberglass Pool

    Is monitoring calcium hardness important in a fiberglass pool? If so, why?

    Thanks!
    East TN
    13,000 gal San Juan Fiberglass Pool;SWG; GoldLine Pro Logic Controls
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    pwrstrk's Avatar
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    Calcium Hardness in Fiberglass Pool

    Ideally Ch levels for a fiberglass pool should be around 200-250 to protect the gelcoat. What are your CH levels ? 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: Calcium Hardness in Fiberglass Pool

    I thought it was only important for concrete pools because it pulled the calcium out of the walls of the pool. I never thought about the gelcoat. The lady at the pool store told me I didn't need to worry about CH because my pool is fiberglass. Right now it is about 150. I guess I should raise it. Thanks for the info!!
    East TN
    13,000 gal San Juan Fiberglass Pool;SWG; GoldLine Pro Logic Controls
    Hayward Sand Filter; Hayward Max-Flo XL Pump;Polaris 380; Hayward ColorLogic LED
    Raypak Gas Heater

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    Mod Squad jblizzle's Avatar
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    Re: Calcium Hardness in Fiberglass Pool

    Some gelcoats have calcium in them ... most do not.
    Jason, TFP Moderator
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    Re: Calcium Hardness in Fiberglass Pool

    How can I find out if mine has calcium? Thanks!
    East TN
    13,000 gal San Juan Fiberglass Pool;SWG; GoldLine Pro Logic Controls
    Hayward Sand Filter; Hayward Max-Flo XL Pump;Polaris 380; Hayward ColorLogic LED
    Raypak Gas Heater

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    Richard320's Avatar
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    Re: Calcium Hardness in Fiberglass Pool

    Quote Originally Posted by creechy View Post
    How can I find out if mine has calcium? Thanks!
    Who knows? Contact San Juan Pools and ask. I think it's usually old pools that needed Calcium. You're almost there, anyway. CH will go up with evaporation. If you're worried, just use Cal-hypo instead of bleach to chlorinate until you reach 200, and then switch back to bleach.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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