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Thread: Pool Stains ???

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    Join Date
    Mar 2012
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    Northern California
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    Pool Stains ???

    I had to drain my pool down yesterday to lower my CYA. While the water was down I took some pictures of the side wall. When the water was full, I thought it looked like a mustard algae or something similar. Now that I see it with no water, I'm not sure. My pool is 28 years old and yes, it's the original plaster. We plan on re-plastering or pebble tech within the next two years, but it's not in the budget right now. Are these blotches a stain of some sort, or is it just the plaster wearing thin? Yesterday prior to the drain, my numbers are listed below.

    FC 5
    TC 5
    CC 0
    PH 7.3
    TA 200
    CH 350
    CYA 200
    Salt 3400
    Water temp 68 deg



    32,000 Gallon Plaster Pool
    Hayward Aqua Plus 40k Gallon Chlorine Generator w/ Controls PL-PLUS
    Pentair IntelliFlo Variable Speed Pump
    Polaris 3900 Sport Automatic Pool Cleaner
    Polaris 3/4 hp Booster Pump
    Pentair/PacFab Nautilus D.E. Filter 48 Sq Ft

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    In the Industry


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    Phoenix, AZ
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    Re: Pool Stains ???

    To determine if this is a metal stain, try rubbing a vitamin c tablet on a stained area for 1-2 minutes. If the stain fades, then you are looking at a metal (copper) stain. If not, the stain is likely organic..and you should shock your pool.

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    Join Date
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    Re: Pool Stains ???

    I tried rubbing the vitamin C tablet on the stain and it didn't do anything. The stains have been there for at least 2 1/2 years (since I bought the house) and the pool is 28 years old with the original plaster. I think it might be the plaster that is deteriorating rather than an organic stain. Is there a way I could find out without shocking the pool if it really is an organic stain? I don't want to go through the trouble of shocking the pool if it's the plaster. Thoughts???

    PS After my water change, my levels are as follows:
    FC 3
    TC 3
    PH 7.6
    TA 325
    CH 310
    CYA 75
    32,000 Gallon Plaster Pool
    Hayward Aqua Plus 40k Gallon Chlorine Generator w/ Controls PL-PLUS
    Pentair IntelliFlo Variable Speed Pump
    Polaris 3900 Sport Automatic Pool Cleaner
    Polaris 3/4 hp Booster Pump
    Pentair/PacFab Nautilus D.E. Filter 48 Sq Ft

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    Butterfly's Avatar
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    Re: Pool Stains ???

    You can try rubbing with a trichlor tab to test for organic staining.

    If no results, go back with some crushed vitamin C (the cheap stuff) in a sock and let it sit on the stained area for a little while to test for metal staining.
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    Re: Pool Stains ???

    Quote Originally Posted by Butterfly
    You can try rubbing with a trichlor tab to test for organic staining.

    If no results, go back with some crushed vitamin C (the cheap stuff) in a sock and let it sit on the stained area for a little while to test for metal staining.
    I tried the trichlor tab today and it didn't do anything. I then tried the crushed vitamin c in a sock and left it for 5 hours, it also did nothing. I'm really starting to think that it's the age of the plaster and the plaster deteriorating. Is this what old plaster does, or am I way off base?
    32,000 Gallon Plaster Pool
    Hayward Aqua Plus 40k Gallon Chlorine Generator w/ Controls PL-PLUS
    Pentair IntelliFlo Variable Speed Pump
    Polaris 3900 Sport Automatic Pool Cleaner
    Polaris 3/4 hp Booster Pump
    Pentair/PacFab Nautilus D.E. Filter 48 Sq Ft

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    duraleigh's Avatar
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    Sebring, Florida
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    Re: Pool Stains ???

    28 year old plaster?? No doubt you have got your money's worth Yes, it looks like worn plaster to me and your tests certainly would indicate that as well.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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