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Thread: High total dissolved solids

  1. Back To Top    #1

    Join Date
    Aug 2008
    central kansas

    High total dissolved solids

    I take the first sample of the year to the pool store, here are results
    FC .4
    CC .4
    CC 0
    TA 96
    PH 7.4
    CH 158
    CYA 12
    TDS 3000
    SAT INDEX -.28
    I just pulled the winter cover back, pool is cloudy with a greenish tint. I am starting to vacuum out the leaves.
    I ran all last year on BBB and loved it. The pool store told me to drain and refill do to high TDS. I pour my bleach directly in the pool and thought I read that the bleach has salt or solids in it, What should I do? Thanks
    20k inground fiberglass
    sand filter
    k-2006 test kit

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: High total dissolved solids

    The TDS level almost never makes any difference. You should not be replacing water, or making any other decision, based only on the TDS level. TDS is total dissolved solids. The total doesn't matter, what matters are specific levels, like the CYA level, which can be measured separately. A high TDS level might mean that you should do some additional testing, but it doesn't mean anything by it's self.

    Adding bleach directly to the pool is just fine. Bleach does contain some excess salt, and a few other trace ingredients, but the amounts are small and almost never amount to anything significant.

    Your numbers are fairly good for a spring opening. You need to bring CYA up to the 30 to 50 range, and start/continue adding chlorine. Everything else is fine where you are now.
    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

  3. Back To Top    #3

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: High total dissolved solids

    Between the 25" or so rain you get in central Kansas and the backwashing you probably do weekly with the sand filter, you should be automatically having your water diluted enough to not build up the salt level that quickly. I suspect their TDS reading might be wrong unless you used a pool cover pump to keep rainwater out of the pool and you don't backwash regularly or for very long.
    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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