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Thread: Cannot maintain chlorine

  1. Back To Top    #1

    Join Date
    Mar 2010
    Location
    Ridgeway, SC
    Posts
    25

    Cannot maintain chlorine

    OK, I think I may know where I am and what I need to do, but ask you experts for help...

    FC - 1.0
    PH - 7.5
    TA - 110
    CYA - 40 (added Pool Calculator recommended CYA 2 days ago)
    CH - 300

    I have a SWG. My daily tests of FC have not exceeded 1.5. I add Pool Calculator recommended amount of bleach each day, and, next morning, back to same low level. Is my SWG not generating chlorine (new cell last year - all lights green)? Do I need to wait for the CYA to stabilize and maintain with bleach, and then do chlorine demand test? Or, do I do chlorine demand now? I question because I believe the thought is that after adding CYA, it takes a week or so to get accurate readings?

    Thanks in advance

    Oldogface
    17,000 gal fiberglass. 1.5hp pump, Pentair 60 sf DE filter and Pentair IC-20 SWG, TF Test Kit, BBB

  2. Back To Top    #2
    sonflower's Avatar
    Join Date
    Jun 2010
    Location
    Fort Worth, TX
    Posts
    157

    Re: Cannot maintain chlorine

    Quote Originally Posted by oldogface
    I have a SWG. My daily tests of FC have not exceeded 1.5. I add Pool Calculator recommended amount of bleach each day, and, next morning, back to same low level.
    What is the Combined Chlorine? Perhaps something is consuming your chlorine. Happened to me. In which case, shock is the answer.

    Quote Originally Posted by oldogface
    Is my SWG not generating chlorine (new cell last year - all lights green)?
    With Aqua Rite you can tell if it's generating chlorine by the bubbles coming out of the returns.
    Pool: (2003) IG Plaster 14,209 gallon (Water Surface 421 sq. ft.) ~ Spa: 18" raised kidney
    Triple spillway (Waterfall) ~ With 6' slide ~ Hayward's Goldline Controls Aqua Rite Digital Electronic Chlorine Generator (Salt System) ~ 40K Salt Cell ~
    ~ AquaLink RS -4 ~ Purex Whisper Flow 2 HP~ Aquatech 60 sq. ft. DE Filter Normal Pressure 22 # ~ MiniMax NT (Propane) Heater 400,000 BTU ~ Jandy Valve Actuator ~Letro Legend Cleaner ~ K-2006 & K-1766 Test Kits

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Cannot maintain chlorine

    With a SWG, it is very important that the CYA level be correct. The recommended CYA level with a SWG is between 70 and 80. At significantly lower CYA levels, there is no way the SWG can keep up with the chlorine demand. Until your finish getting the CYA level up, you should manually add extra chlorine to help the SWG keep up.
    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

  4. Back To Top    #4

    Join Date
    Feb 2008
    Location
    Denton, TX
    Posts
    5,061

    Re: Cannot maintain chlorine

    I would suggest manually dosing your pool with liquid chlorine or bleach this evening and then doing an overnight FC loss test. Shut the SWCG off after the sun sets and check your FC. Then, check it again in the morning before the sun hits the water. If you lose more than 1 ppm FC overnight, you need to shock your pool.

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