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Thread: Lowering Calcium Hardness

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    Join Date
    May 2007
    Location
    Enid, Oklahoma
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    53

    Lowering Calcium Hardness

    The Numbers:

    CH 520
    pH 7.6
    TA 190 (down from 290 after two weeks of aerating and two gallons of Muriatic Acid to lower the pH)

    My fill water comes from my well and the CH out of the well is 430. I'm assuming that my CH would only get higher after water evaporates and concentrates over time.

    My water is very clear but feels extremely hard to my skin. The water in this part of the state is extremely hard...hot water tanks fill up with minerals quickly around here.

    Is there any way to lower the CH with chemicals? I've had the extreme idea of unhooking my water softener tank (after a regen) and hauling it out to the pool and running water through it via a sump pump. I'm sure my Culligan dealer would **** a brick if he saw me do that.
    20K IG Fiberglass, 3/4 hp Sand, Hayward ColorLogic

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: Lowering Calcium Hardness

    Actually, that's probably the best (almost only...drain and refill is the other) way to do it and has been done by posters on this forum before. I have no personal experience but someone else may come along who does.

    You may hear about using TSP, but don't.....you'll be inviting an algae bloom.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    mas985's Avatar
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    May 2007
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    Pleasanton, CA
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    The problem with home water softeners is that they are made for fairly low volumes of water. So a fill will wipe it out fairly quickly. Check the volume on your unit to see if it will handle it.

    You could refill right after they change the tank but you won't have any soft water after the refill and probably only half the water will be soft.

    I have heard of people renting water softeners but I am not sure who would do this.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  4. Back To Top    #4

    Join Date
    May 2007
    Location
    Enid, Oklahoma
    Posts
    53

    Re: Lowering Calcium Hardness

    Quote Originally Posted by duraleigh

    You may hear about using TSP, but don't.....you'll be inviting an algae bloom.
    I read some sites that talk about TSP, but most of those were also selling magnets and other weird things so I decided to discount that advice as bunk. There seems to be a lot of junk science surrounding pool water.
    20K IG Fiberglass, 3/4 hp Sand, Hayward ColorLogic

  5. Back To Top    #5
    You can reduce the calcium by running your fill water through a water softener, only problem it
    will take a lot of salt and many recharges to process that amount of water you need. In your
    case it might be the only solution as what good does it do to drain your pool and refill it with the
    same high calcium water.

    Cliff s

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