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Thread: Copper Stain Blue Plaster - Pictures

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    Join Date
    Aug 2009
    North Central Texas

    Copper Stain Blue Plaster - Pictures

    I'm not asking for help, rather just wanted to post these pictures I took yesterday. This is staining left after a serious acid wash in 2008 and an AA treatment in Fall 2009. Since the AA treatment I have kept sequestrates in the pool but mostly for iron staining from our dust/sand/silt. (Fill water has no iron)

    The acid wash was after pool had been sitting for many months, over the winter and into the next summer because of leak taking the level down, frogs establishing a breeding pond, lots of calcium scale, organic and metal stains embedded in calcium scale. We didn't hit the copper stains any harder than we did for fear of too much damage in the aging plaster.

    The stains are very, very slowly lightening, but it may take years for them to lighten enough for my eye.

    Ionization had been used in pool for about 18 years, but the most staining (but not all) occurred when the pool sat, unfiltered, and no backwashing to dilute the copper, with Floatron still working away throwing copper in pool, for a few sunny winter months.

    Note in first three pictures the line where most of the staining has occurred. Most easily seen in first picture, starting right below the bottom step. This was the water line level when pool was closed due to leak that I could not find. Prior to closing the pool in the fall 2007 pool was filtered 24/7 with pool cleaner running several hours a day. I kept water topped up all summer by almost continuous topping up with fresh water. Cost for water replacement, over the summer, >$1000.

    There is virtually no staining were the water pooled while doing the acid wash. During acid wash "bowl" of acid water was neutralized several times and pumped out of pool. So there is a nice stain free "bowl" in deep end.

    The iron mostly stains the calcium scale and it is harder to release from the scale but hardly stains the plaster.

    The copper hardly stains the calcium scale. It mostly stains the plaster that is free of calcium scale.

    Iron staining is relatively easy to remove, via AA treatment. Copper stain could possibly be for the life of the plaster. When we did the acid wash we didn't get all of the calcium scale off of some areas for fear of too much damage to the plaster. BUT, by keeping the pH always below 7.5 and adequate use of the sequestrate 1) no more iron staining, 2) copper appears to be slowly releasing, 3) Calcium scale is slowly releasing.

    1981, 25K, IG, Blue Plaster 1996, somewhat oval, widens a bit at shallow end, 1.5" pipes, 2" at Pad, 1 separate main drain, 1 skimmer, 4 returns + dedicated cleaner return, 10 ft deep end with very fast decline from shallow, Pentair Quad 80 DE, Pentair Intelliflo VF, 3/4 HP Booster Pump (equipment pad about 8 ft below top of pool), Challanger 3/4 Trash/Emergency Pump 120v, Polaris 280 (pressure), iRobot Verro cleaner (robotic), Aquabot Turbo (robotic), Jacuzzi Tracker 4X (vacuum) Pool Blaster (Buster), Two (2) PoolSkims, Solar Breeze (solar powered top skimmer) (beta to ver. 2, release date 2010), ColorSplash LED replacement bulb. Aries 550 gal separate spa, 2002 (our 3rd and BEST spa) , BBB-Bromine

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    In the Industry
    Pool Clown's Avatar
    Join Date
    Sep 2008
    Silicon Valley, CA

    Re: Copper Stain Blue Plaster - Pictures

    That sort of staining or modeling is what we in the industry call personality!
    Factory Warranty Station for:
    Jandy/Zodiac, Pentair, Sta-Rite, Raypak (Rheem, Rudd), Polaris,
    and Paramount pool cleaning systems.

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    Join Date
    May 2009
    Dallas, TX

    Re: Copper Stain Blue Plaster - Pictures

    Quote Originally Posted by Pool Clown
    That sort of staining or modeling is what we in the industry call personality!
    That's nice! My pool has a lot of personality as well!
    20K gal IG plaster pool, Manually chlorinated with bleach, 1.5 HP Sta-Rite Dura-Glas II pump, Pentair FNS Plus 48 DE filter, Polaris 280

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    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Copper Stain Blue Plaster - Pictures

    Hey, Alice,

    What a great post. It should be required reading for anyone having metal issues. Very nicely documented and your conclusions make a great deal of sense.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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