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Thread: What is Total Dissolved Solids?

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    Join Date
    Aug 2009
    Location
    Central New Jersey
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    What is Total Dissolved Solids?

    Hi Everyone! I went to the pool store today to test my water because I had run out of my cya reagent their test results are as follows;

    fac 3
    tac 3
    ph 8
    ta 120
    cya 50
    tds 1650

    What is TDS? Their recommendations are to partially drain and refill, I have lost some water already due to a small leak last week. I have been adding about 64oz of bleach everyday but also noticed that the water is starting to get cloudy and notice some algae.
    12,600 gallons
    Cartrige filter
    1 hp pump
    24x18 Above Ground Oval

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    Join Date
    Feb 2008
    Location
    Denton, TX
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    5,061

    Re: What is Total Dissolved Solids?

    TDS = Total Dissolved Solids

    TDS is basically a test to show you how much is dissolved in the water. Anything, and I mean anything that is dissolved in your water will reflect on the TDS and this is also why TDS isn't of much use to us. After all, what good does it do for you to know something is in your water without knowing what it is? It is much better to know the individual components, rather than the sum of all of them.

    You don't need to drain water, you need to shock your pool. Lower your pH to 7.2 using muriatic acid first. Your CYA is 50 and therefore, you need to raise your FC to 20 using bleach. Hold it at shock level until your water clears, you end up with less than 0.5 on your CC, and your overnight FC loss is 1 or less.

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    svenpup's Avatar
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    Nov 2009
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    Sacramento, CA
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    Re: What is Total Dissolved Solids?

    TDS is irrelevant. Your FC is low for your CYA. At CYA = 50 you should always have it above 4, which means you targeting 6-8 when you add chlorine.

    If you have algae you need to shock (instructions in my signature).

    Also your pH is high. You need to add enough muriatic acid to lower it to 7.2 before you shock.
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

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    Join Date
    Mar 2007
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    Coastalish 'down easter'
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    Re: What is Total Dissolved Solids?

    Welcome to TFP!!

    TDS is basically BS!

    Pool stores who offer free testing often use it to get you to drain the pool and buy more chems from them

    They'll often say the the water has lost it's 'elasticity' so newly added chems won't work properly.

    However, the truth is that most of the TDS is salt and people purposely add ~ 3000 ppm of salt to their pools when they have a SWCG.

    In short; TDS isn't something you need to worry about
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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    Guest

    Re: What is Total Dissolved Solids?

    1,650 TDS is well below the 2,500-3,000 recommended upper levels as well. Sounds like somebody is trying to sell you something.........

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    Join Date
    Aug 2009
    Location
    Central New Jersey
    Posts
    14

    Re: What is Total Dissolved Solids?

    Thanks everyone for your quick responses! I had never heard of it, I new better than to listen to him I was just curious of what it was. Now I'm starting to shock, I really don't know what happen to my water, I thought I had it under control by adding 64oz of bleach everyday.
    12,600 gallons
    Cartrige filter
    1 hp pump
    24x18 Above Ground Oval

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