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Thread: Cloudy & Can't Hold Chlorine

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    Cloudy & Can't Hold Chlorine

    TC 1.5
    CC 1.5
    PH 6.9
    CYA 80
    Alkaliity 142
    Hardness 349

    Inground, vinyl, 23,000 gallons, Pump runs 7 X 24 .... 3 pucks in the two skimmers

    Super shocked (21 lbs) 8 days ago and held for 24 hours .... super shocked (21 lb) the next day and held chlorine over 10 PMM for 24+ hours

    A few days after shock chlorine goes to zero even with 3 3" pucks in each skimmer and pump runs 7 x 24

    Pool now cloudy, barely see drain '8 ft down, and algae on floor.

    What is happening

    I just raised the PH and hit it again with 4 gallons of liquid chlorine
    Inground concrete pool w/vinyl liner
    20' x 40' pool
    Holds 30,000 gallons
    Hayward S220T 22" Sand Filter
    Hayward 1.5HP Super-pump

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD
    Welcome to TFP!

    With a CYA level of 80 you need to bring your FC level up to 20 and hold it there to kill all the algae growing in your pool. Shocking to lower levels might knock it down a bit but it is unlikely to kill everything off.

    As your CYA gets higher you need to use higher and higher FC levels to prevent algae. Using pucks is adding even more CYA. You are already as high as it is a good idea to go with CYA. At the current rate you will soon be well above that. I suggest you switch to liquid chlorine/bleach as your only chlorine source. It won't add any more CYA.
    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

  3. Back To Top    #3
    thanks for you reply. I was thinking the same thing but pool store did not think so. I went to another pool store to get liquid chlorine. I am going to switch to liquid chlorine, and do my own testing. What is a good test kit for FC, TC, PH, and CYA?
    Inground concrete pool w/vinyl liner
    20' x 40' pool
    Holds 30,000 gallons
    Hayward S220T 22" Sand Filter
    Hayward 1.5HP Super-pump

  4. Back To Top    #4
    check out my sig for a great test kit. There are other good ones available, but not put together with the same amount of thought and support you will get from Dave. Reagents are in sized that are useful, and the instructions are quite clear. Any questions you have, Dave (and others who know their stuff) is here to solve all your woes!

    Moved to "Testing the Water" by TMQ 7/31/07

    8200 gallon 20' x 48" round vinyl frame pool,
    Intex SWCG, 12" sand filter, 1600gph pump, TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, Chlorine/CYA Chart
    "Shock" is a process, not a product!

  5. Back To Top    #5

    Join Date
    Jul 2007
    I have a similar size pool, 22k gal. Get the regular chlorine jugs from the pool store (2.5gal sodium hypochlorite, 10-12% strength). And stop using any kind of pucks, they contain CYA.

    A chemical chart I have says 1gal of 12% will raise 12,000gal to 10ppm. Pouring two jugs in my pool raises FC to about 25ppm.

    99% of the time, don't bother listening to pool stores. With the exception of the owners/managers, most of them are part-time students. No offense to anyone.... just the facts... at least in my area.
    22,000 gal in-ground, 3-8ft
    Cartridge filter
    Pebble Tec resurfaced
    Polaris 360

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