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Thread: Draining the Pool 40k gal?

  1. Back To Top    #1

    Join Date
    Jul 2016
    Wrightstown, NJ

    Draining the Pool 40k gal?

    I am having trouble with my pool water. It is cloudy, has some pink slime and the test results at below. It is also eating up the chlorine tabs at about 25 tabs (1" tabs) a day.

    Free Chlorine .14ppm
    Total Chlorine 1.26ppm
    Combined Chlorine 1.11ppm
    pH 7.1
    Hardness 88 ppm
    Alkalinity (w/ stabilizer correction) 68ppm
    CYA over 149ppm
    Copper .3ppm
    Iron .1ppm
    Phosphate 0ppm

    Pool store says the best way to approach this is to drain the pool (all the way if possible) and start over with fresh water. This is about a $2k refill. Any help or suggestions would be appreciated.

    I am going for a third water test tomorrow to make sure their reading are accurate.

    40,000 gal; In-ground; vinyl liner; Sand Filer; 2 aqua-genie's; Hayward pump 2 speed; built in 1993; new liner in 2010; no test kit used, rely on pool store for testing; no heater; well water used to fill.

  2. Back To Top    #2

    TFP Guide
    triptyx's Avatar
    Join Date
    Apr 2016
    Tucson, AZ

    Re: Draining the Pool 40k gal?

    Welcome to TFP! A few items to start.

    Pool Store testing - especially CYA, is notoriously unreliable. In order for us to give you the help you need, we're going to need you to get us test results from a fully-featured Test Kit. We recommend the K-2006C (get the C version if you're going to choose this kit - it has more reagents and you're going to need them), or for the best value, a TF-100 (you can get these here: ). That is going to get us the numbers we're going to need to help you unravel this problem.

    First of all, what's killing you is the CYA. It's going to be high no matter whose test you run. The reason is those 25 tablets you're feeding it a day. The longer you do that, the more water you're going to have to drain! STOP immediately and let's get you onto bleach or another chlorine type that doesn't have CYA! Again, the more CYA you add to that pool, the more water you're going to have to drain to clear it up.
    8,500gal plaster in-ground with attached spa, two floor drains, one skimmer. Chlorine, City Water.
    Pentair WhisperFlo 1hp Pump, MagnaTek Midcentury EPlus motor, Pentair CleanNClear 200SF Cartridge filter, Purex Triton MiniMax 250 Gas Heater, Pentair SunLite, AutoFill.
    Kreepy Krauly Cruiser, TF-100 with SpeedStir. :D

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