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Thread: Rough white areas in deep end of pool

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    Rough white areas in deep end of pool

    I have rough areas in the deep end of my pool. The white areas are very hard. It seems like there is now some algae that has formed in these areas. Does anyone know what causes this and how to get rid of it?
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    25,100 gallon pool
    Vinyl liner
    Sand filter
    Caribbean Clear system
    (bleach, muratic acid, baking soda, small amount of copper)

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    Texas Splash's Avatar
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    Re: Rough white areas in deep end of pool

    Rough areas can often be an indication of scaling. Spots might be algae or metal staining. Would you happen to have a full set of test results you could share from a TF-100 or Taylor K-2006?
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Re: Rough white areas in deep end of pool

    Thanks for the reply. I don't have any test results. I noticed the white raised areas before I closed the pool for the winter. I swam down and felt that the white spots were raised and very hard. I just removed the winter cover this week and saw that the areas are getting larger.

    I would think that if this is algae, the surface would be slippery. The white raised areas are definitely not slippery.
    25,100 gallon pool
    Vinyl liner
    Sand filter
    Caribbean Clear system
    (bleach, muratic acid, baking soda, small amount of copper)

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    borjis's Avatar
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    Re: Rough white areas in deep end of pool

    I like all the components shown on your sig under Caribbean Clear System.

    That is all but "small amount of copper." --that could be the darkness you are seeing...metal staining.

    Hard stuff could be calcium.

    But we won't know anything for a fact until some test results are posted.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

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    Re: Rough white areas in deep end of pool

    The "small amount of copper" comes from the Caribbean Clear system. I have had my pool for seven years now (built it myself). Never had any trouble with the pool chemistry, but I kept ruining clothes that were splashed with bleach from WalMart. 2 years ago I switched to a Salt Water Generator system....hated it. Ladder and slide started rusting, electricity bill went thru the roof among other issues. About the same time I noticed these spots starting to develop. I removed the system and went back to the old standby.... These white spots keep getting larger with every year and they are starting to look unsightly.

    How can I tell if the spots are calcium, and what can be done about it?
    25,100 gallon pool
    Vinyl liner
    Sand filter
    Caribbean Clear system
    (bleach, muratic acid, baking soda, small amount of copper)

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    Mod Squad pooldv's Avatar
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    Re: Rough white areas in deep end of pool

    As you have observed calcium scale is a condition that develops slowly over time and gets progressively worse. It is caused by having high CSI over a sustained period causing calcium to deposit in the pool.

    More here, Pool School - Calcium Scaling
    And here, Langelier and Calcite Saturation Indices (LSI and CSI)

    You can sand the scale with wet dry sand paper to smooth it. EDIT: this only applies to plaster pools. Poolmath will calculate your CSI for you after you enter all your test data. Keeping the CSI aggressively negative -0.5 to -0.6 and brushing as often as you can stand to will slowly reduce the calcium scale. It will be about as slow as it took to to get where you are now, months or years.
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    borjis's Avatar
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    Re: Rough white areas in deep end of pool

    I'd be very concerned about sanding the scale with a vinyl liner, won't that harm it?
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

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    Mod Squad pooldv's Avatar
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    Re: Rough white areas in deep end of pool

    Ooooopppps! Sorry, didn't catch that. You are correct, do not sand the scale on a vinyl liner.
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    Re: Rough white areas in deep end of pool

    Here are the results of the water tests. Keep in mind that I am just opening the pool for the first time from the winter.
    Free Chlorine: 0
    pH: 7.2
    TA: was 40, now at 80 after adding baking soda
    TH: 80
    CYA: 30
    25,100 gallon pool
    Vinyl liner
    Sand filter
    Caribbean Clear system
    (bleach, muratic acid, baking soda, small amount of copper)

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    Mod Squad pooldv's Avatar
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    Re: Rough white areas in deep end of pool

    Those numbers do not indicate likelihood of scaling.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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