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Thread: 7 dy old dk replaster; heavy CA stains; no acid start up

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    ajgiii's Avatar
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    May 2008
    North Virginia

    7 dy old dk replaster; heavy CA stains; no acid start up

    Hi All:

    Our pool is a Sylvan, built in 1988. Originally white with bullnose clay brick coping. Circa 2005, it was replastered to dark with paver type coping. We purchased the house in 2006. Since then, egg-shell cracking (20 this year) began and proliferated, and some plaster popped off. So we hired a company to replaster the pool. Owner is very experienced and knowledgeable.

    Probably 40% of the shallow end plaster was chipped off and removed. Replaster (subcontracted) was complete late on May 14th, pool was filled by evening of the 16th: 30,000gal. We were not instructed to introduce acid as we filled the pool (as I've read elsewhere). After pool was filled, I believe pool company used only standard pool start up chemicals: algaecide, shock, and the like. They didn't have many packages.

    Water chem on May 18th: pH = 7.5; Cl = 0; Alkalinity = 110; Hardness = 150; Water temp was 68°F.

    Heavy calcium residual existed from the start; pool company owner told us to brush 2x day and that the calcium would disappear. It's reduced a bit; not gone. His assessment yesterday was to go heavy acid on the pH, brush for 3 days and rebalance the water ....the stuff that appears to be standard start up procedures for replastered pools....but 8 1/2 days after replaster and 7 days after filling.

    He said the alternative is to drain the pool and acid wash. Based on what I've read (now), I believe that would be the more sure way of clearing the surface.

    What opinions might you have as to successfully obtaining a uniform, dark surface?

    Attached photos are of the new plaster on May 18th.

    Attached Images Attached Images
    30K gallon, inground w/integral spa, blue/gray plaster; Pentair Intelliflo pump, D.E. filter, Ultraflow UV generator, Hayward tab chlorinator, Polaris 360, Raypak propane

    "As long as you are in the seat...Make a Difference"
    ---Captain James T. Kirk, circa 2293

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    Re: 7 dy old dk replaster; heavy CA stains; no acid start up

    I think its refered to as a acid bath when the pool stays full, and that with brushing may correct the issue. I am not sure if its less destructive to the plaster than acid washing . The dark color may be making the surface look worse than it truely is.

    Should your CH be so low on a newly plastered pool? I would think the water would want to draw out the calcium to compensate.
    20k gal. IG fiberglass/plaster rectangle 32'x16'
    Hayward Superpump 3/4 H.P. primary Hayward model 5060 Booster Pump
    Hayward Pro Series High Rate Sand Filter
    Pentair Model 320 automatic Chlorine/bromine in-line feeder

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