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Thread: Had Water Tested Now Puzzled

  1. Back To Top    #1

    Join Date
    Jul 2007
    Location
    Northwest Indiana
    Posts
    1

    Had Water Tested Now Puzzled

    We have Intex 32 x 12 pool that holds 7600 gallons of water with a pump that does 2500 GPH. I've been testing with the HTH kit from Walmart. I thought my level were good, but then I had it tested at the pool store. The numbers are different on pH, Alkalinity, and Calcium Hardness. My question is should I try to bring these more inline? Also my combined chlorine seem high? I've been using the BBB method and the water looks great. I'm probably cleaning with vacuum every other day and trying to keep as much I can out of the pool. One more thing the chlorine hardly ever moves in the last week I only had the floater in the pool and have not added any liquid chlorine. I'm not sure but this the first year with a solar cover ( uncovered during the day and in direct sunlight from 10am till 4pm ) and stabilizer



    My Test:
    TC 3
    pH 7.2
    Alk 90
    CH 220
    CYA 35

    Pool Shop Test:
    FC 1.6
    CC 1.3
    pH 7.6
    CH 120
    CYA 35
    Alk W/stabilizer correction 50

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887
    Welcome to TFP!

    Keep in mind that test results are not perfect, the same water can give different results even if you do everything correctly. Also, while there are some good pool stores, many of them are quite incompetent and will make large errors when testing water.

    When the HTH actually gives a reading it is generally quite good. It is sensitive to high chlorine levels and metals in the water, but you don't have high chlorine levels and metals in the water prevent you from getting any reading on the calcium test, so I doubt you are having any problems there.

    If your CC is really 1.3 you should shock the pool. CC at that level should cause the color on the HTH chlorine test to shift from the FC number up to the TC level over several seconds.

    The only numbers you really disagree with the pool store on are PH and CH. Everything else is within testing variability. The HTH PH test is quite good, I would go with your numbers on this. CH is more difficult to guess at. Since you have a vinyl liner I wouldn't worry about it. CH doesn't really mater in a vinyl pool.
    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

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