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Thread: Softwater Pool vs Calicum Hardness

  1. Back To Top    #1

    Join Date
    Oct 2008
    Yuma, AZ

    Softwater Pool vs Calicum Hardness

    I have a 14,800 gallon fiberglass inground pool with a Spa overflow and a SWG. The water in the Pool is SOFTWATER (water for pool goes through my home softwater system) which requires me to add a calicum hardness increaser every 90 days to maintain a 200-220 calicum level. TFP recommends the 200-220 calicum hardness level to prevent damage to the gel-coat of a fiberglass pool. My question follows:

    Does the fact that my pool contains softwater have any effect on maintaining the 200-220 calicum hardness level?
    14,000gal IG Fiberglass pool with 850 gal spill over spa, Whisper Flo 1hp pool pump, Whisper Flo 2hp spa pump, DE filter, Zodiac Clearwater LM3 SWG, "Heat Siphon" Model SX5HP pool/spa heater, a water leveler and a Kreepy Krauly cleaner

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Softwater Pool vs Calicum Hardness

    Yes, but only in the obvious way. The soft water system takes out calcium and replaces it with small amounts of salt. You then need to manually add some of the calcium back in. The end result is nearly the same as if your water was naturally soft, except that you end up with a little extra salt.

    Ideally you want to fill the pool with a mixture of softened water and untreated water, so you don't need to manually add calcium, but the difference is small enough that it isn't worth any significant extra effort if doing so is in any way difficult. I hope that makes sense.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Re: Softwater Pool vs Calicum Hardness

    Or you could add some Cal-Hypo shock once a week. I use the rule of thumb as followed: For every 10 ppm FC added by Cal-Hypo, it also increases Calcium Hardness (CH) by 7 ppm. The experts would have to fill you in on the bad things Cal-Hypo add in addition.

    Thank you by the way. I think you solved my Calcium build up problem. I am off to buy a small watersoftner for my fill line.
    45 year old 21,470 inground white plaster pool, 2 speed 1/8 3/4 HP pump, Peregrine Industries Smartemp heat pump heater, 175 Sq Ft. Hayward cartrage filter.

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