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Thread: Will calcium hardness affect a pool heat pump ?

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    Will calcium hardness affect a pool heat pump ?

    Hello all,

    Just need to verify if the pool store is trying to sell me a load of cr@p again, I have a vinyl liner pool and at 1st I was taken by the pool store into buying chemicals to keeping up ch levels because it would harm my pool. Since than I have learned, thanks to this forum that the ch level isn't really important in a vinyl liner pool.

    Now they are telling me that the ch will affect my heat pump, is this true ?

    Thanks for all the help .....
    Fatcat07, In ground pool, Vinyl Liner, 18 X 36 Pool size, 30,000 Gallons
    Hayward Heat Pump - Hayward HeatPro Heat Pump
    Hayward Filter DE2420 - 24 sq ft (I think)
    Hayward pump - Not sure of the model number
    Suffolk, long Island

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Will calcium hardness affect a pool heat pump ?

    They are correct, but ONLY if your CH is very HIGH! Low CH won't affect your HP or anything else in your vinyl pool. It will however, affect their pocketbook because you're not buying calcium to enrich their bottom line. That's what they're really worried about.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Join Date
    Jun 2012
    Bolton Ontario Canada

    Re: Will calcium hardness affect a pool heat pump ?

    I follow this advise, despite the fact that the manual for my heater suggests 200 ppm min. Why do you think they suggest that?
    16x32 vinyl
    80,000L chlorine
    21" Hayward sand filter

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    In the Industry

    bdavis466's Avatar
    Join Date
    Aug 2014
    Riverside, CA

    Re: Will calcium hardness affect a pool heat pump ?

    There is a theory that calcium can form a protective barrier on the inside surface of copper (or any metal) piping...this theory is questionable at best.

    A lot of the misinformation comes from the negative side of the CSI/LSI scale being classified as corrosive. Most associate corrosive being in relation to metals but in reality a more accurate term for very negative CSI is etching. A low CSI (typically from low calcium levels) will pull the calcium out of the plaster which will damage the pools surface. Prolonged low pH is far more detrimental to your heater (which significantly contributes to the CSI/LSI scale).

    You do not have this issue in a vinyl pool and your calcium hardness level can pretty much be ignored.
    33K Pool/Spa, Pentair Equipment
    Davis Custom Construction - Home Page

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