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Thread: Starting up SWG, adding salt, TDS, help!

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    Starting up SWG, adding salt, TDS, help!

    Hello,

    I have been happily on the BBB system for the past year and a half and am so happy I had found this site...never had any pool issues, and been adding bleach and testing daily. I decided to bite the bullet and order a new SWG cell (previous owners had existing SWG system but cell had died). Before I added the salt, I used salt test strips to test my salt ppm, and measured 1600ppm. This seemed high to me since all I had added since my drain and refill 1.5 years ago was bleach, so to double check my reading I took my sample into the dreaded pool store, where the feedback I received was "TDS is way too high, you must drain your pool or a SWG system will not work properly." I took it with the grain of salt that I use when I go into pool stores, and walked out, but forgot to ask what my ppm level of TDS actually was. My question is:

    1. Is adding 1-2ppm of bleach every day for the past year and a half enough to raise my salt levels to 1600ppm?
    2. If yes to #1 above, to bring my salt level to 3500ppm, would I just add the equivalent of 1800ppm (3500-1700=1800)?

    Here are my pool stats:

    12000 gal
    3ppm FC
    0ppm CC
    280 CH
    60ppm CYA
    7.4 pH
    92 deg F (live in AZ)

  2. Back To Top    #2
    linen's Avatar
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    Re: Starting up SWG, adding salt, TDS, help!

    50 ounces of bleach (to raise your FC by 2 ppm) adds 3.3 ppm salt to your 12000 gallon pool.

    3.3 X 365 X 1.5= 1806 ppm salt...of course you have had splash out and you may not be maintaining the pool 365 day/year...but you have added a lot of salt.

    As you already know, ignore TDS. By the way 1600 of the number they measured is salt.

    Quote Originally Posted by azxd09
    2. If yes to #1 above, to bring my salt level to 3500ppm, would I just add the equivalent of 1800ppm (3500-1700=1800)?
    Yes. 3500-1600=1900 ppm salt to add.
    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: Starting up SWG, adding salt, TDS, help!

    Thank you for the response! I feel much better now.

  4. Back To Top    #4

    Re: Starting up SWG, adding salt, TDS, help!

    It is usually best to add less than the full amount of salt to avoid overshooting the target level. I would suggest targeting about 500 ppm lower than the target. If your salt system has a salt readout, check that first before adding the final amount of salt.

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