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Thread: Output of gritty substance

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    Output of gritty substance

    I have an above ground pool ( aprox. 20,000 gal) with a Compu-Pool SWG and a Hayword Sand Filter. The SWG is new to the pool this year. I am having problems with the system outputting a lot of gritty substance I believe to be sand. I did not have this problem until I installed the SWG. Any suggestions as to what is causing this?

    Mike
    25000 gallons kidney shape in-ground plaster pool
    10ft at deep end, diving board
    2 skimmers and 6 return lines
    Hayward DE6020 Pro-Grid 60-Square-Feet Vertical D.E. Pool Filter with 2" Hayward Vari-Flo SP715
    Hayward Super Pump 2hp Sp2615x20
    Hayward 3/4 HP Booster Pump Model 5060

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    Mod Squad JohnT's Avatar
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    Apr 2007
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    SW Indiana
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    Re: Output of gritty substance

    Welcome to TFP.

    Could be calcium. Post a complete set of test results for best advice.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: Output of gritty substance

    What type of test are you needing?
    25000 gallons kidney shape in-ground plaster pool
    10ft at deep end, diving board
    2 skimmers and 6 return lines
    Hayward DE6020 Pro-Grid 60-Square-Feet Vertical D.E. Pool Filter with 2" Hayward Vari-Flo SP715
    Hayward Super Pump 2hp Sp2615x20
    Hayward 3/4 HP Booster Pump Model 5060

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: Output of gritty substance

    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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    Re: Output of gritty substance

    Free chlorine = 1ppm, PH = 7.2, Total Alkalinity = 120 ppm, & Cyanuric Acid = 30-50 ppm
    25000 gallons kidney shape in-ground plaster pool
    10ft at deep end, diving board
    2 skimmers and 6 return lines
    Hayward DE6020 Pro-Grid 60-Square-Feet Vertical D.E. Pool Filter with 2" Hayward Vari-Flo SP715
    Hayward Super Pump 2hp Sp2615x20
    Hayward 3/4 HP Booster Pump Model 5060

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    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
    Posts
    9,089

    Re: Output of gritty substance

    Quote Originally Posted by migraine
    Free chlorine = 1ppm, PH = 7.2, Total Alkalinity = 120 ppm, & Cyanuric Acid = 30-50 ppm
    Calcium Hardness is the key number we need.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: Output of gritty substance

    I'll try to get a sample to the local pool supplier this week.
    25000 gallons kidney shape in-ground plaster pool
    10ft at deep end, diving board
    2 skimmers and 6 return lines
    Hayward DE6020 Pro-Grid 60-Square-Feet Vertical D.E. Pool Filter with 2" Hayward Vari-Flo SP715
    Hayward Super Pump 2hp Sp2615x20
    Hayward 3/4 HP Booster Pump Model 5060

  8. Back To Top    #8

    Re: Output of gritty substance

    Okay, went by my local pool supply store and had my water tested here are the results: FAC = 2.5; TAC = 2.5; PH = 7.6; TA = 120; Calcium Hardness = 250; CYA = 50; & Phosphates = 500. I hope this helps. Let me know if there is additional information needed. thanks.
    Mike
    25000 gallons kidney shape in-ground plaster pool
    10ft at deep end, diving board
    2 skimmers and 6 return lines
    Hayward DE6020 Pro-Grid 60-Square-Feet Vertical D.E. Pool Filter with 2" Hayward Vari-Flo SP715
    Hayward Super Pump 2hp Sp2615x20
    Hayward 3/4 HP Booster Pump Model 5060

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Output of gritty substance

    It might be calcium, or it might be sand. There are a couple of different ways of checking. The most reliable is to gather a little of the substance and put a few drops of muriatic acid on it. If it is calcium it will foam up, while sand won't really react at all. Another way to check would be to lower the PH to 7.2. If it goes away at the lower PH then it is calcium.
    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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