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Thread: What causes hardness to increase?

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    coog61's Avatar
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    What causes hardness to increase?

    Pool started in June 2009 (17.5k gal, SWG). CH was in the 300 - 350 range last year. Tested for CH today (for the first time this year) and have a reading of 400 from the pool store and 450 from the TF kit.
    What causes the hardness to increase? Have only added acid and baking soda on a regular basis.
    We do have naturally hard water, but with our cold winter I can't believe much fresh water went into the pool in the last 3 months (auto fill). Will CH continue to creep up after I drain 20% and refill?

    Thanks
    17,500 Gallon, SWG 33' x 21' freeform w/ Sunstone Cobalt Plaster. Attached 6 X 6 Spa raised 12" w/ 6 Jets with Moss Rock Spillover. 25' Moss Rock Waterfall. Pentair Intelliflo VS-3050 for Pool, 2 HP Whisperflo for Waterfall, Pentair Clean & Clear Cartridge 320, Pentair 400K BTU Max-E-Therm heater, Pentair Intellichor, Pentair EasyTouch 4P, Pentair Legend Platinum Cleaner w/ 3/4 hp pump, autofill system, nat gas fire pit. BBB convert

    http://www.troublefreepool.com/new-tx-pool-t17907.html

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    duraleigh's Avatar
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    Re: What causes hardness to increase?

    What is the CH of your fill water?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    coog61's Avatar
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    Re: What causes hardness to increase?

    CH of fill water is 130
    17,500 Gallon, SWG 33' x 21' freeform w/ Sunstone Cobalt Plaster. Attached 6 X 6 Spa raised 12" w/ 6 Jets with Moss Rock Spillover. 25' Moss Rock Waterfall. Pentair Intelliflo VS-3050 for Pool, 2 HP Whisperflo for Waterfall, Pentair Clean & Clear Cartridge 320, Pentair 400K BTU Max-E-Therm heater, Pentair Intellichor, Pentair EasyTouch 4P, Pentair Legend Platinum Cleaner w/ 3/4 hp pump, autofill system, nat gas fire pit. BBB convert

    http://www.troublefreepool.com/new-tx-pool-t17907.html

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    JasonLion's Avatar
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    Re: What causes hardness to increase?

    Any time you replace water lost to evaporation, you are adding more CH. Water evaporates, but the CH stays in the pool. Then, when you add more water, you are adding more CH, so the level will constantly go up. There are two ways to reduce the CH level, remove water from the pool (splashout, backwashing, or pumping water out) which removes CH along with the water, or get a service company to do a RO treatment.
    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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    Richard320's Avatar
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    Re: What causes hardness to increase?

    You're not using Calcium Hypochlorite for Chlorine are you?
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    coog61's Avatar
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    Re: What causes hardness to increase?

    have not used Calcium Hypochlorite
    17,500 Gallon, SWG 33' x 21' freeform w/ Sunstone Cobalt Plaster. Attached 6 X 6 Spa raised 12" w/ 6 Jets with Moss Rock Spillover. 25' Moss Rock Waterfall. Pentair Intelliflo VS-3050 for Pool, 2 HP Whisperflo for Waterfall, Pentair Clean & Clear Cartridge 320, Pentair 400K BTU Max-E-Therm heater, Pentair Intellichor, Pentair EasyTouch 4P, Pentair Legend Platinum Cleaner w/ 3/4 hp pump, autofill system, nat gas fire pit. BBB convert

    http://www.troublefreepool.com/new-tx-pool-t17907.html

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