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Thread: Can't hold free Chlorine

  1. Back To Top    #1

    Join Date
    Jun 2015
    Albuquerque, NM

    Angry Can't hold free Chlorine

    I have a 22K gallon saltwater pool using an AquaPure Pro. I have been trying to get the Free Chlorine to stabilize for 4 weeks. I can generate about 2 parts Free Chlorine if I boost the pool for 24 hours, but after a day or so it is back to 0. My Phosphate = 100, The Ph = 7.7. Total Cl = 1.01. Combined Cl = 0.71. I have shocked with non-chlorine oxidizer. Total Alkalinity = 75. What can I do to maintain free Cl other than run the boost for 24 hours every other day? I am running pump 10 hours per day. I have tried as high as 90% generation on the AquaPure Pro. Am I going to have to add Cl tablets every few days to keep the free Cl? Of course if I add Cl directly I will turn the AquaPure to 0%. The AquaPure unit is new about 45 days ago. Salt Level = 3000.

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Can't hold free Chlorine

    Those look like pool store results.

    And I see no CYA level listed.

    Low CYA and New Mexico sun makes what you describe inevitable.

    You need to spend a little time in Pool School and decide if you;re willing to take control of the pool or not. You don;t have to read it all. Start easy

    Pool School - Read This BEFORE You Post
    Pool School - ABCs of Pool Water Chemistry
    Pool School - Recommended Pool Chemicals
    Pool School - Salt Water Chlorine Generators
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  3. Back To Top    #3
    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Columbia, SC

    Re: Can't hold free Chlorine

    Welcome to TFP!!

    If you have read around here much you have probably seen that not much credence is given to pool store testing. While you would think that a "professional" would be the best, unfortunately in most cases it is quite the opposite. Between employees who blindly trust the word of chemical sales representatives and high school kids working in the pool store for the summer you end up with poor results from their testing.

    So the decision you have to make is are you going to follow the pool stor advice or TFP methods. Mixing pool store advice/testing with TFP methods is just another recipe for disaster.

    To follow the pool care methods taught here you need to arm yourself with the knowledge and tools necessary to care for your pool.

    The knowledge is condensed in the Pool School link at the top of every page. Richard has already pointed out four important articles.

    In additon to the knowledge, you need the tools mto do the job right. The tools are not limited to the brushes, vacuum hoses and other stuff you use around the pool, but include the most important item - one of the recommended test kits. You can buy a kit at a pool store, but again the pool store kits generally won't cut it. To effectively practice the TFPC methods, the FAS/DPD chlorine test is essential. All these kits contain that test while very few other kits do. Think of it this way, do you see a doctor blindly prescribing drugs without seeing the patient or having tests run?
    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

  4. Back To Top    #4
    tackettaj's Avatar
    Join Date
    May 2015
    Mooresville, NC

    Re: Can't hold free Chlorine

    @Larry Stroup

    Listen to the experts here at TFP..they know their stuff! I'm a new pool owner and haven't set foot in a pool store except to get a nice free bottle to use for my OWN testing.
    -25,000 gal. freeform gunite, smooth quartz finish w/ spa
    -2 hp Jandy Pro Series Stealth; Jandy Pro Series Cartridge Filter (CV340)
    -Jandy Pro Series AquaPure Chlorinator; Jandy Pro Series JXi Heater
    -Zodiac MX8 cleaner; Taylor K-2005 DPD Complete Chlorine Kit

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