Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 6 of 6

Thread: Chlorine Block

  1. Back To Top    #1

    Join Date
    May 2016
    Location
    East Brunswick NJ
    Posts
    3

    Chlorine Block

    Hi all,

    i am am new to this site and am so glad I found it. I have a 38,000 gallon in ground pool with a sand filter , vinyl liner, and salt generator. When I opened it it was green, it is now cloudy and the stores tell me I have a chlorine block, high copper and low alkalinity. These are my most recent water test results:

    free chlorine .23ppm
    tot. Chlorine. 2.12
    combined chlorine 1.89
    ph. 6.3
    hardnesd 47
    alkalinity 9
    cyn acid 54
    copper 1
    iron .3
    phophate 320

    i was told to add 60lbs of alkalinity, mineral stain out and non-chlorine shock. I would greatly appreciate
    any advice. Thank you!!

  2. Back To Top    #2

    TFP Guide

    AimeeH's Avatar
    Join Date
    Apr 2012
    Location
    Columbia SC
    Posts
    1,837

    Re: Chlorine Block

    HI. Welcome to TFP

    There really isn't any such thing as "chlorine block." And unfortunately we don't trust pool store test results much. To clear your water you need to SLAM the pool. You will need a proper test kit to get through the process.

    Shock
    Level
    And maintain

    Have you had a chance to browse any of the articles in pool school. I reccomend these.

    Pool School - ABCs of Pool Water Chemistry

    Pool School - Test Kits Compared

    Pool School - SLAM - Shock Level And Maintain
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

  3. Back To Top    #3

    Join Date
    Apr 2016
    Location
    College Station, TX
    Posts
    79

    Re: Chlorine Block

    Hello Gkrea! Welcome to the forum!

    I am not an expert, but just a beginner here but I've seen the responses to new folks that I can get the ball rolling...

    First, you need a good test kit - Taylor TF-100 with XL or K-2006C will do it. The tests in the cheap I kits just won't be accurate enough. I learned the hard way.

    Second, the pH, if that is correct, is waaaay low. My method for fixing it would be to add baking soda and aeriate the water. But that may be low enough to warrant a more drastic fix.

    The high CC tells me your chlorine is working hard and needs help- from more chlorine. Get to the pool school and read about the SLAM method to get the chlorine level up to shock levels and clear the water up.

    That's some first steps. I know the experts will chime in shortly with more precise directions.
    Intex 16'x32'x54" 17Kgal AGP since 2014. Sand filter, Hayward skimmer, home built 10'x15' deck and stairs, solar heater. High TA tap water, moderate rainfall, weekly use. Treated with 10% bleach, MA and some dichlor initially. Soon to add borates.
    Taylor K2006C
    Future projects - automatic chlorine pump, online pool sensors, better heater, IGP (maybe)

  4. Back To Top    #4

    TFP Guide

    AimeeH's Avatar
    Join Date
    Apr 2012
    Location
    Columbia SC
    Posts
    1,837

    Re: Chlorine Block

    Baking soda will raise TA with little effect to PH.

    Yes both those numbers in your post are extremely low which is one reason I'm suspect of the test results.

    I think usually you can find a test kit to test PH and TA locally retail. But what you'll be missing is the fas-dpd and CYA tests. Both of these tests are imperative to maintaining your own water and clearing it up. That is what we advocate here. Yes, you'll spend money on a test kit up front but you will never need to blindly throw away money on chemicals while not understanding why the pool store is telling you to add them.

    There will be many people here to answer questions if you need it.
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

  5. Back To Top    #5

    Join Date
    May 2016
    Location
    East Brunswick NJ
    Posts
    3

    Re: Chlorine Block

    Thank you all for the advice. I will read the suggested articles and pick up a good test kit today.

  6. Back To Top    #6
    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Location
    Columbia, SC
    Posts
    8,497

    Re: Chlorine Block

    Quote Originally Posted by Gkrea View Post
    Thank you all for the advice. I will read the suggested articles and pick up a good test kit today.
    You are not going,to find one of the recomended test kits locally. They need to be ordered as no pool,store stocks them. They will tell you what they sell is all you need, or what they sell will work. They are wrong.

    As to the pH, they are generally close on that. I'm going to,guess you use 3" tabs to chlorinate and shock the pool each week with powder. Both of those are acidic,and have driven your pH way too low. You need to use 20 Mule Team Borax to gat that number back up in the 7's.

    You really need to order a test kit today so you have it ASAP.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •