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Thread: Cloudy after brushing...Calcium on walls?

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    ka8yiu's Avatar
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    Cloudy after brushing...Calcium on walls?

    I have a fiberglass pool, and I can wipe my finger across the walls and get a slight white residue on my fingers.

    The day that I brush the walls, my pool is slightly cloudy the remainder of the day, but crystal clear all other days.

    Test numbers:

    8/23 - 0745

    FC 10.5
    CC 0.5
    TC 11
    pH 7.4
    TA 60
    CH 250
    CYA 50

    8/24 - 0800 (the day of brushing, but before it was brushed)

    FC 9.5
    CC 0.5
    TC 10
    pH 7.5
    TA 80 (I added baking soda yesterday afternoon)
    CH 250
    CYA 60

    I checked the CH AFTER brushing, vacuuming and cleaning the filter and I got 275, twice.

    Is this just the calcium depositing on the walls, and is it any issue to worry about?

    Kevin
    8K gal IG Fiberglass (San Juan Waikiki I)
    TF-100 Testing Kit
    Hayward Max-Flo VS Pump
    Hayward Star Clear Plus Cartridge Filter
    Pentair Model 320 Automatic Chlorine/Bromine In-Line Feeder

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    Mod Squad pooldv's Avatar
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    Re: Cloudy after brushing...Calcium on walls?

    The test results here do indicate scale, but if PH is usually higher it could be scale. More here, Pool School - Calcium Scaling
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    ka8yiu's Avatar
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    Re: Cloudy after brushing...Calcium on walls?

    I am getting a CSI of -0.09. The CSI in Pool Math says for all pools, greater than 0.06 is problem for all pools. Since "Less than -0.6 is suggestive of problems for plaster, tile, stone, and pebble pools."does not mention fiberglass, I am reading it as not a real concern at this time.
    8K gal IG Fiberglass (San Juan Waikiki I)
    TF-100 Testing Kit
    Hayward Max-Flo VS Pump
    Hayward Star Clear Plus Cartridge Filter
    Pentair Model 320 Automatic Chlorine/Bromine In-Line Feeder

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    Mr Bruce's Avatar
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    Re: Cloudy after brushing...Calcium on walls?

    Can you check the baking soda you added (have been adding?) to see if it says "activated" or anything like that?
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    ka8yiu's Avatar
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    Re: Cloudy after brushing...Calcium on walls?

    I see no indication on the bag of "activated." It is Arm & Hammer, 5# bag bought at grocery.

    The issue is not new. It's been like that the 3 months I've been here.

    According to Pool Math, hovering over the CSI does read "balanced".
    8K gal IG Fiberglass (San Juan Waikiki I)
    TF-100 Testing Kit
    Hayward Max-Flo VS Pump
    Hayward Star Clear Plus Cartridge Filter
    Pentair Model 320 Automatic Chlorine/Bromine In-Line Feeder

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    Re: Cloudy after brushing...Calcium on walls?

    The only other thing I can possibly think of is if the previous owner used dry acid to lower pH, I know that that adds sulfates and can weaken plaster. I know you are fiberglass, I assume it would be similar. I don't know how to test for sulfates, perhaps someone else will chime in.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    ka8yiu's Avatar
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    Re: Cloudy after brushing...Calcium on walls?

    Well, bottom line is that it's not bad, just noticeable.

    Tnx
    8K gal IG Fiberglass (San Juan Waikiki I)
    TF-100 Testing Kit
    Hayward Max-Flo VS Pump
    Hayward Star Clear Plus Cartridge Filter
    Pentair Model 320 Automatic Chlorine/Bromine In-Line Feeder

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    Mod Squad pooldv's Avatar
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    Re: Cloudy after brushing...Calcium on walls?

    Quote Originally Posted by ka8yiu View Post
    I am getting a CSI of -0.09. The CSI in Pool Math says for all pools, greater than 0.06 is problem for all pools. Since "Less than -0.6 is suggestive of problems for plaster, tile, stone, and pebble pools."does not mention fiberglass, I am reading it as not a real concern at this time.
    That is correct, negative CSI has no impact on FG or vinyl pools. Anything below 0 is good for your pool.
    TFP Moderator
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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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