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Thread: How to lower CH

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    How to lower CH

    I have a SWG and my reading upon opening this year for CH is do I lower it? I would hate to drain half my pool.....30k pool. I had scale last year and used Jack's magic to get it out upon closing and perhaps the calcium is now in suspension? My phosphates are high and I read where phosphates can react with calcium allowing the filter to take it out....true? All other readings ok FAC 2 TAC 2 Salt 3100 CYA 90 TA 100 PH 7.5

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: How to lower CH

    Option 1: drain and replace with lower CH water
    Option 2: (VERY limited locations) Reverse Osmosis treatment

    That is it.

    You can manage the high CH ... Richard is a Pro ... by maintaining lower pH.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: How to lower CH

    Drain and refill and wait for rain.

    Also consider what the fill water is. If your tap water is 200 CH, and your pool is 600, draining half won't bring it to 300.

    Plug your numbers into the pool calculator and see what the CSI is and what happens if you drop pH a little and reduce TA. Keep CSI O +/- .3 and you won;t have problems, even when CH climbs.

    I reduce mine during the season by using pool water on the lawn and then refilling. Same amount of water gets used, but the Calcium gets out of my pool.
    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.
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    linen's Avatar
    Join Date
    Jul 2010
    Twin Cities, MN

    Re: How to lower CH

    Quote Originally Posted by msipos
    My phosphates are high and I read where phosphates can react with calcium allowing the filter to take it out....true?
    According the chem geek in this post:, some potential "calcium reducers" are based on this phenomenon. However, again according to chem geek, the phosphate levels required are much higher than typical. Also, we have not heard of much (any?) success of these "calcium reducers".
    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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    Re: How to lower CH

    Thanks guys I do have a water softener for the house as we do have hard water here in Ambler PA so guess I should leave the softener on? that is not bypass it as I was told to do when refilling my pool? unfortunately the lawns here in PA are green....I dump it out in the woods as concerned about the salt water hurting the lawn?

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: How to lower CH

    Your house softener is not capable of removing that much calcium that fast. You will overload your back and your pocketbook hauling salt. You CAN use it as refill water as the load will not be so much by doing just a little at a time.

    Keep your pH from 7.2 - 7.4 and you should see no calcium scale and your CH will eventually drop if you refill with softened water.

    If you decide to drain, the pool water is harmless to your yard.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  7. Back To Top    #7

    Re: How to lower CH

    Thanks---I'll do a little at a time whle in meantime keeping ph low.....also would adding borates help? I did read that would help stabilize my ph to keep it from rising?

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