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Thread: Calcium Hardness Increase and the Pool Calculator

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    benavidescj's Avatar
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    Apr 2010
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    Calcium Hardness Increase and the Pool Calculator

    I drained over half my pool a few days ago to get my CH down some because it was at 630ppm. Well I overshot the drain and when I did a test (Taylor K-2006) it was at 110ppm (11 drops). My fill water is 70ppm. Anyways, I wanted to get back up to around 200ppm but I wanted to do it slow so I started with 10lbs calcium chloride. Adding 10lbs should have brought me up to around 150ppm per the pool calculator. Checked it today and low and behold it came out to 320ppm (32 drops). What happened? Is there something wrong with my calculation or is there something wrong with the pool calculator? I let the water mix one day when I did the refill and waited another day after adding the calcium chloride before testing.
    Carlos
    Pool: 28,000 gallons IG; IC 40 SWG; Pentair 120 gpm cartridge filter; Marble finish; Pentair Wisperflow 1.5 hp; Polaris 360
    Spa: 350 gallon; Bromine
    How to shock your pool

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    JasonLion's Avatar
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    Re: Calcium Hardness Increase and the Pool Calculator

    Most likely your new fill water and your original pool water did not thoroughly mix and when you did the test that showed CH of 110 you were testing mostly new fill water that only had a little pool water mixed into it. I suggest leaving the pump running for 24 hours to really throughly mix everything and then measure CH again.
    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

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    benavidescj's Avatar
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    Re: Calcium Hardness Increase and the Pool Calculator

    Makes sense to me. Thought a full day at 24/7 would have mixed it well. As it turns out 320 ppm is in the sweet spot. What is odd is the salt level was at 1600ppm and the calculator told me to put in 11 - 40lb bags of salt to get to 3400. It hit right on the money at 3400 ppm.
    Carlos
    Pool: 28,000 gallons IG; IC 40 SWG; Pentair 120 gpm cartridge filter; Marble finish; Pentair Wisperflow 1.5 hp; Polaris 360
    Spa: 350 gallon; Bromine
    How to shock your pool

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    Brentr's Avatar
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    Oct 2009
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    Jacksonville, FL
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    Re: Calcium Hardness Increase and the Pool Calculator

    Carlos, it appears that we have very hard water in Jacksonville. After 2 partial drains 2 mths ago I went from 775 to 400 however it is back up to 475. If I were you I would let it rise slowly because you will get out of range soon.
    6,000 gal, IG free form,Beach Series Antigua by Marbletite Pebble finish,Sheer Descent, IG Fountain, Dolphin / Mermaid Statues,Dura- Glas 1.5hp pump,Hayward Pro-grid DE4820, Aqua Rite SWG with T-Cell 15,Heat Siphon Heat Pump DX 5.0 109,000 btu, Pool Cage, 1800sq ft Tremron Estate Pavers,Aquatherm Ecosun Solar Panels 192 sq ft with GL-235 Controller,Pentair IntelliBrite, Apollo Magnetic Stirrer Our New Poolbuild, Jacksonville, FL yr 2009 Solar install Outdoor kitchen upgrade

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