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Thread: Best process for removing blue staining from plaster?

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    Cavecreeker's Avatar
    Join Date
    Dec 2008
    Location
    Cave Creek Arizona
    Posts
    5

    Best process for removing blue staining from plaster?

    Hello from Cave Creek AZ!

    My entire IG spa (plaster) is stained blue. (about 6ft dia maybe 350 gal)

    I suspect it is copper from heat exchanger corrosion.

    =>What are my removal options/techniques?

    Plaster is about 8 years old. It had been acid washed about a year ago (same reason) - a little too aggressively as some gunite might be peaking through (darker patches). Got one replaster (quartz) quote for ~$2000 (includes possible drain fixture replacements that may be required after chipping)

    => Is this price in the ballpark for PHX AZ?

    Water chem neglect is the culprit. My Pentair MiniMax Plus 400 Heat exchanger sprung a leak too but that's a separate story - it's fixed but I want to square away Spa plaster before I start up spa (with new religion and commitment I might add).
    Pool:
    Pentair Challenger
    Pentair Waterfall
    Nautilus FNS 48 DE
    Zodiac LM3
    Ultrapure UPP25
    Poolvergnuegen
    Spa:
    Pentair Challenger
    Hayward DE2400
    Ultrapure UPP15

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    Cavecreeker's Avatar
    Join Date
    Dec 2008
    Location
    Cave Creek Arizona
    Posts
    5

    Re: Best process for removing blue staining from plaster?

    I poured 3 gallons of Muriatic acid into spa (~400 gallons), stirred and let sit for 12 hours. Blue turned light gray and brushed off easily as I pumped out the water.
    Pool:
    Pentair Challenger
    Pentair Waterfall
    Nautilus FNS 48 DE
    Zodiac LM3
    Ultrapure UPP25
    Poolvergnuegen
    Spa:
    Pentair Challenger
    Hayward DE2400
    Ultrapure UPP15

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