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Thread: Blue stain on sides on in-ground pool

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    Blue stain on sides on in-ground pool

    I'm not too savvy on posting pictures but if this thread needs it I'll do my best later.

    I've had this home for two years and it has been blessed with a trouble free pool for the last 12-16 months. Water was always clear and levels were acceptable. Then we started seeing a dark blue algae looking infestation on the walls of our pool where there isn't much sunlight hitting it. I can scrape off a bit with my finger, but it's very thin. For all I know it's a stain.

    Today I got an algae brush and put some muscle into scraping the sides of the pool with it where this blue algae or stain is. Nothing changed. I'm unsure what it is or where to go from here. Would draining the pool and acid washing the sides fix this?

    Thanks in advance.
    In-Ground 12000 Gallon Pool/Plaster Walls/Hayward S244T Sand Filter/Chlorine/1.5 HP pump
    Phoenix, AZ

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    Mod Squad jblizzle's Avatar
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    Re: Blue stain on sides on in-ground pool

    Welcome to TFP!!!

    Did the substance feel slimy between your fingers?

    I think pictures are going to help in this case. Here is one method:
    how-to-add-pictures-to-a-post-full-guide-with-screenshots-t45050.html
    Jason, TFP Moderator
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    Re: Blue stain on sides on in-ground pool

    It isn't slimy so it must be some kind of stain.

    In-Ground 12000 Gallon Pool/Plaster Walls/Hayward S244T Sand Filter/Chlorine/1.5 HP pump
    Phoenix, AZ

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    Mod Squad jblizzle's Avatar
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    Re: Blue stain on sides on in-ground pool

    I can not see the picture, could be my firewall, but looking at the text of your post, I do not think you linked to the correct URL.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Blue stain on sides on in-ground pool

    I didn't. Working on it.
    In-Ground 12000 Gallon Pool/Plaster Walls/Hayward S244T Sand Filter/Chlorine/1.5 HP pump
    Phoenix, AZ

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    Re: Blue stain on sides on in-ground pool

    Got it!

    In-Ground 12000 Gallon Pool/Plaster Walls/Hayward S244T Sand Filter/Chlorine/1.5 HP pump
    Phoenix, AZ

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    Re: Blue stain on sides on in-ground pool

    Here's another. Hope this helps.

    In-Ground 12000 Gallon Pool/Plaster Walls/Hayward S244T Sand Filter/Chlorine/1.5 HP pump
    Phoenix, AZ

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    Re: Blue stain on sides on in-ground pool

    Could you post a complete set of test results, importantly including a test for copper?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Melt In The Sun's Avatar
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    Re: Blue stain on sides on in-ground pool

    To expand a little on Dave's request...do you use a copper-based algicide in the pool? At first glance it looks very much like a copper stain.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
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    Richard320's Avatar
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    Re: Blue stain on sides on in-ground pool

    I suspect it's some scale that has been dyed with copper compounds. Betcha the pH is high.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    Re: Blue stain on sides on in-ground pool

    Two years and 12-16 months clean with a current onset of algae (if that's what it is) raises the CYA flag in my mind. Have you been using tablets to chlorinate? Have you read through Pool School? (Link on the upper-right of every page)
    14,500 gallons, Clean and Clear 150 cartridge, IG, gunite, USQ 1152 1.5 hp motor (3450 rpm), Pentair Pinnacle Pump

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    Re: Blue stain on sides on in-ground pool

    I think there are two problems. Yes, blue/black copper (oxide) staining, and also "black algae" spots.

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    Re: Blue stain on sides on in-ground pool

    I think you all are spot on. Thank you for the ideas. I'm pretty sure it's copper related and will try using some chemicals for that and reply back on my results.
    In-Ground 12000 Gallon Pool/Plaster Walls/Hayward S244T Sand Filter/Chlorine/1.5 HP pump
    Phoenix, AZ

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    dmanb2b's Avatar
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    Re: Blue stain on sides on in-ground pool

    hold a vitamin c tab against the stain...if it lifts it's metal. I agree with on balance as well...almost looks like black algae too.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Re: Blue stain on sides on in-ground pool

    Draining and acid washing today. Will post pictures again later this week. Thanks again to you all for the help.
    In-Ground 12000 Gallon Pool/Plaster Walls/Hayward S244T Sand Filter/Chlorine/1.5 HP pump
    Phoenix, AZ

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    Richard320's Avatar
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    Re: Blue stain on sides on in-ground pool

    Quote Originally Posted by labbatsbrew
    Draining and acid washing today. Will post pictures again later this week. Thanks again to you all for the help.
    We never did see any test results....

    It's pretty important to figure out exactly what it is, so steps can be taken to prevent it from happening again.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Mod Squad jblizzle's Avatar
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    Re: Blue stain on sides on in-ground pool

    I agree ... seems like a sudden drastic step ... or you got advice from somewhere else and we do not have full information.

    Would hate for you to spend the time, effort, and money only for stains to reappear.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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  18. Back To Top    #18

    Re: Blue stain on sides on in-ground pool

    I had planned to acid wash my pool this November for a while now. Gotta say it was a lot of work but I'm glad I did it myself. Saved a ton of money.

    Stains are still showing even after scrubbing the heck out of them but I bought some product for copper stains and will keep you all advised. I don't own a test kit and frankly I've been putting off taking the water sample in for analysis at Leslie pool due to it being a moot point until after I drained and acid washed the pool.

    Took the advice of this site and invested in several chemicals and the Taylor K2006 test kit from Amazon.com. Looking forward to using them. I've just had enough of pool guys and finally let the guy go. Some friends recommended this site and I've been anxious to get started. I'll be sure and post water results when I get the Taylor kit.
    In-Ground 12000 Gallon Pool/Plaster Walls/Hayward S244T Sand Filter/Chlorine/1.5 HP pump
    Phoenix, AZ

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    Mod Squad jblizzle's Avatar
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    Re: Blue stain on sides on in-ground pool

    Sounds like you are making some good decisions by taking control and getting a test kit. We are here to help if you need questions answered

    Posted from my Droid with Tapatalk ... sorry if my response is short
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  20. Back To Top    #20

    Re: Blue stain on sides on in-ground pool

    Got the test kit today. The blue stains on the walls are getting less but are still 2/3 there. Probably will take some time to fix.

    Here's the test results...

    Ph- 7.7
    TA- 120ppm
    FC- 0.6ppm
    CC- 0.2ppm
    Calcium Hardness- 290ppm
    CYA- 0

    Obviously I need to buy more CYA. I used the chlorine tabs with CYA in them from Leslie's Pool but it doesn't seem to be enough. Is the SwimTime brand stabilizer from WalMart any good? I may need to make a run there.

    Thank you
    In-Ground 12000 Gallon Pool/Plaster Walls/Hayward S244T Sand Filter/Chlorine/1.5 HP pump
    Phoenix, AZ

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