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Thread: Where is the Chlorine Going

  1. Back To Top    #1

    Join Date
    Jun 2015
    Location
    Saunderstown RI
    Posts
    7

    Where is the Chlorine Going

    New to taking care of pool chemistry on my own after 11 years of relying on the Pool Store. My SW pool's water had a greenish tint for the first time ever this spring. I bought the TF-100 test kit and got the following numbers:

    FC: 0.5
    CC: 3
    PH: 7.5
    CH: 225
    TA: 110
    CYA: 50

    Decided to shock and added 10 lbs of 65% Cal_Hypo (more than the pool calculator recommended, and I know the danger of raising the CH, but it's what I had on hand).

    In any event, the pool looks absolutely great now, crystal clear, but the new numbers aren't much better:

    FC: 0.5
    CC: 0.5
    CH: 275
    TA: 70
    CYA: 70
    Borates: 40 (I didn't have this test first time around).

    As I said the pool looks great. I'm in RI, so it hasn't been very warm. So where did all the chlorine go? And do I SLAM again. I have purchased 12.5% bleach if need be.

    Thanks from the Newbie.
    32,500 Gal. IG Vinyl Pool, DE Filter, 2 Hp Haywood Pump, Booster Pump for Polaris, Biogard SWG. TF-100 Test Kit w/ Supplemental Borate Test Strips.

  2. Back To Top    #2
    Swampwoman's Avatar
    Join Date
    Apr 2012
    Location
    Grand Rapids, MI
    Posts
    3,527

    Re: Where is the Chlorine Going

    Welcome to TFP.
    It is possible nascent algae is using your chlorine...or also possible that you need to dial in your SWG. Technically, it sounds as if you didn't really slam (as in maintain) if you just "shocked" but the best way to tell if you need to slam is to do the overnight chlorine loss test detailed in the Slam instructions -- with te swg off.

    How long and at what percentage are you running your SWG?
    I'd hazard a guess that may need to be bumped up.

    However, why not add the amount of liquid chlorine you need for you chlorine:cya ratio (see chart/link in my signature) and see if it holds via te OCL test and if so, then see if your swg can produce enough to keep it there...and if not, slam!
    In ground extended Grecian, 22,000 gal, Hayward 220t sand filter, vinyl liner, dolphin m4 supreme.
    If TFP has helped you, please click to SUPPORT TFP!
    Helpful Links:
    GET A TEST KIT Chlorine/CYA Chart How to SLAM About Metals & Stains

  3. Back To Top    #3

    Join Date
    Jun 2015
    Location
    Saunderstown RI
    Posts
    7

    Re: Where is the Chlorine Going

    Thanks.

    After re-reading the SLAM section, I realize I shocked, but didn't maintain. Back to work.
    32,500 Gal. IG Vinyl Pool, DE Filter, 2 Hp Haywood Pump, Booster Pump for Polaris, Biogard SWG. TF-100 Test Kit w/ Supplemental Borate Test Strips.

  4. Back To Top    #4
    Divin Dave's Avatar
    Join Date
    Oct 2013
    Location
    Longview, Texas
    Posts
    4,926

    Re: Where is the Chlorine Going

    Yup. Slamming is a process, not a 1 time treatment.

    When you have CC of .5 or less (1 drop to clear) and you pass the OCLT, and the pool is crystal clear, then you can consider the slam successful and drop the FC back down to regular maintenance levels.

    Quote Originally Posted by John Kearns View Post
    Thanks.

    After re-reading the SLAM section, I realize I shocked, but didn't maintain. Back to work.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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