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Thread: Suggestions on dealing with Heterotrophic Plate Count (hpc)

  1. Back To Top    #1

    Join Date
    Apr 2015

    Suggestions on dealing with Heterotrophic Plate Count (hpc)

    New member but working on pools for some time.

    We have a indoor salt water pool.

    Lately we have had a High Plate count, and have failed the lab tests. We have shocked the pool the first time to 10 PPM, and failed again. I then shocked it with Lithium Shock to 20 ppm and again failed. Drained pool partially and refilled with fresh water, along with shock treatment and were still getting the plate count issues. There are no coliforms present on the lab results. Latest plate count was 1140 CFU/ml acceptable is 100 or less.

    Rather then drain the entire pool, close the facility for 3 days to do it, due to reheating the water, any suggestions on how we can combat this?

    Pool Data;
    volume 67585 Liters
    Acutrol Pool Controller
    Autopilot Lectranators x 2
    Sand Filters x 2
    Temperature maintained is 29-30 Celsius

    Salt water maintained at 3400 ppm
    Ph setpoint is 7.3, maintained by acid tank and pump
    Pool has Wapotec System added on, Hydosan, Hyrdoxan and KlearFloc (coagulate)
    ORP setpoint is 750

    FCL averages between 0.60 and 1.2, TCL is around 2.85 on average.

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

    Re: Suggestions on dealing with Heterotrophic Plate Count (hpc)

    Welcome to TFP!

    Understanding what is going on starts with a getting all of your water test results together. I am particularly concerned with what your CYA level is.

    For an indoor pool, ventilation is also important. And a good description of what the water looks like and what chemical you normally use for chlorine will also help.
    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
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Houston, Texas

    Re: Suggestions on dealing with Heterotrophic Plate Count (hpc)

    I read through a couple of articles to get a better understanding of HPC. Do you have a ordinance in place that sets a limit on how high the HPC is allowed to rise? Did you test the fill water for HPC?
    TFP Moderator
    Helpful links: TF Test Kits,TFP Pool School, PoolMath
    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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