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Thread: Added CyA little brown spots on pool floor.

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    Join Date
    Aug 2008
    Location
    Honolulu
    Posts
    429

    Added CyA little brown spots on pool floor.

    Adding 16 oz CyA little brown spots formed on the pool floor (in-ground plaster), intermittently dispersed. The pool cleaner was going but had not yet hit that area, so I sucked the CyA up into the filter afterwards there were little brown spots left. I then removed them with a wire brush. But what were they?

    Standard Pool specs are as follows:

    Measured pH 7.5
    Total Alkalinity (ppm CaCO3) 70
    Free Chlorine (ppm Cl2) 4.0
    Cyanuric Acid (ppm CYA) 30
    Calcium Hardness (ppm CaCO3) 500
    Total Dissolved Solids (ppm) 3,620
    Total Sulfate (ppm SO42-) 0
    Total Borate (ppm Boron) 50.0
    Total Ammonia (ppm Nitrogen) 0.0
    U.S. Gallons 10,000
    Temperature (oF) 83

    Total Chloride (ppm NaCl) 3212
    Carbonate Alkalinity (ppm CaCO3) 53.7
    Langelier Saturation Index (LSI) -0.05
    % HOCl (vs. Total Free Chlorine) 1.5%
    OCl- (as ppm Cl2) 0.072
    HOCl (as ppm Cl2) 0.058
    Calcite Saturation Level (CSL) 0.66
    Calcite Saturation Index (CSI) -0.18
    10,000 gal plaster pool,3/4 hp WhisperFlo pump, Sta-Rite Great White GW9500 pool cleaner, Hayward 300 lb Sand Filter
    Use Magenta Stuff for Iron and Silica control.
    Balance: pH 7.7 Cl 7 -8 Alk 70-80 CH 325 CyA 30 in winter - 50 in summer NaCl 1010 TDS 1200

  2. Back To Top    #2
    spishex's Avatar
    Join Date
    Oct 2008
    Location
    Hillsborough, NC
    Posts
    1,375

    Re: Added CyA little brown spots on pool floor.

    So if you ever have to add CYA again, go ahead and do it through the skimmer. Takes the stuff too long to dissolve in to leave it on the floor anyway.

    Not sure what the reaction would have been. Were you adding any other chemicals at the same time?

  3. Back To Top    #3

    Join Date
    Aug 2008
    Location
    Honolulu
    Posts
    429

    Re: Added CyA little brown spots on pool floor.

    Spishex,

    Thank you for responding.

    Good idea I will add it through the skimmer. I had added some salt, as I had drained down some; that might be it.

    Aloha.
    10,000 gal plaster pool,3/4 hp WhisperFlo pump, Sta-Rite Great White GW9500 pool cleaner, Hayward 300 lb Sand Filter
    Use Magenta Stuff for Iron and Silica control.
    Balance: pH 7.7 Cl 7 -8 Alk 70-80 CH 325 CyA 30 in winter - 50 in summer NaCl 1010 TDS 1200

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