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Thread: New Season, Old Problems! Staining...

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    Join Date
    Aug 2014
    Location
    San Diego, CA
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    New Season, Old Problems! Staining...

    Hi, I have been using the BBB method for the last two summers and overall it's done a good job of keeping algae away. I have been using a combination of bleach and triclor tablets for chlorination. However, I have always had a problem with yellow/green staining of the entire plaster surface of the IG pool. Vitamin C tablets on the stain makes it go away locally. I did the procedure mentioned here on TFP involving a few pounds of vitamin C powder, and it worked at first...but the stain just reappeared over the coming weeks. Even with liberal use of sequestrant. This has been very frustrating, and am at the point of draining the pool and hiring someone to acid wash and take care of it.

    As of today, coming out of the winter here in San Diego, here are my numbers:

    pH: 8.0
    FC: 8.0
    CC: 0.0
    CYA: >100, maybe 150
    CH: 360
    TA: 120
    Temp: 68F
    TDS: 2000
    Iron: 0ppm
    Copper: The test strips were mostly useless but seemed to indicate I have less than 1ppm of copper
    Pool: 15k gal IG plaster, DE filter, water is 2yrs old

    Any suggestions on how to get rid of the stain and more importantly keep it from coming back? I am considering draining the pool to get the CYA, CH, and TDS numbers down, but I don't want to go through that expense unless it will help with my staining problem.

    Here is a pic that shows what I mean. It is looking down into the water at my step. You will see a yellowish/greenish stain that is the bane of my existence.


    Thanks for anything you are able to suggest to help!

    IMG_0125.jpg

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    Mod Squad pooldv's Avatar
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    Re: New Season, Old Problems! Staining...

    Do you know what the source of the copper is? Algaecide? Copper heat exchanger and PH below 7.0? Do you have a heater? Mineral system?

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    PAGirl's Avatar
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    Re: New Season, Old Problems! Staining...

    What are you using to test? What do you keep your FC at? Your CYA is quite high.

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    Re: New Season, Old Problems! Staining...

    Welcome to the forum.

    Your pH is too high! Lower it and keep it lowered.....down to about 7.4 and then KEEP it there.

    If you'll do that, I'll bet your staining issues will be dramatically reduced.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: New Season, Old Problems! Staining...

    Quote Originally Posted by wertygrog View Post
    Hi, I have been using the BBB method for the last two summers and overall it's done a good job of keeping algae away. I have been using a combination of bleach and triclor tablets for chlorination. However, I have always had a problem with yellow/green staining of the entire plaster surface of the IG pool. Vitamin C tablets on the stain makes it go away locally. I did the procedure mentioned here on TFP involving a few pounds of vitamin C powder, and it worked at first...but the stain just reappeared over the coming weeks. Even with liberal use of sequestrant. This has been very frustrating, and am at the point of draining the pool and hiring someone to acid wash and take care of it.

    As of today, coming out of the winter here in San Diego, here are my numbers:

    pH: 8.0
    FC: 8.0
    CC: 0.0
    CYA: >100, maybe 150
    CH: 360
    TA: 120
    Temp: 68F
    TDS: 2000
    Iron: 0ppm
    Copper: The test strips were mostly useless but seemed to indicate I have less than 1ppm of copper
    Pool: 15k gal IG plaster, DE filter, water is 2yrs old

    Any suggestions on how to get rid of the stain and more importantly keep it from coming back? I am considering draining the pool to get the CYA, CH, and TDS numbers down, but I don't want to go through that expense unless it will help with my staining problem.

    Here is a pic that shows what I mean. It is looking down into the water at my step. You will see a yellowish/greenish stain that is the bane of my existence.


    Thanks for anything you are able to suggest to help!
    Welcome to TFP

    I see you have been reading the site for a while so you know some of what we recommend and that is good.. Please do the extended CYA test, use 1 quart pool water and 1 quart tap water mixed together and then test your CYA, that will give us a better idea of where your CYA is.

    If your CYA is 120 (just an example) your FC minimum would be 9 and your daily target would be 14, it goes much higher if your CYA is really 150
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