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Thread: Calcium Hardness is almost non-existent

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    Calcium Hardness is almost non-existent

    Is it normal for my water from my outside faucet to not have hardly any CH in it? I tested it as I was filling up my spa with my Taylor K-2006 and the CH is only about 10. Is this normal. I live in Southern Indiana and like the rest of the country we have had a lot of rain lately so could that be the cause. I am going to buy some calcium chloride to increase it but this just seems so low.
    18 x 40 inground pool, 27,000 gallons Built in 2012. Vinyl with a SWG. SwimClear cartridge filter by Hayward C3030, Aqua Rite SWG T-Cell 15. Hayward SP2610X15.

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    linen's Avatar
    Join Date
    Jul 2010
    Twin Cities, MN

    Re: Calcium Hardness is almost non-existent

    Do you have a well or is it municipal water? Low ch is not that unusual in municipal water.

    What is your pool water CH? Since you liner is vinyl, I wouldn't worry about adding CH.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: Calcium Hardness is almost non-existent

    Vinyl liners DON'T require any CH. Save your money.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Calcium Hardness is almost non-existent

    For your spa which is likely acrylic, you would only need CH if you found the water to foam too much. Raising the CH to around 120-150 ppm can help reduce foaming.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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