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Thread: Plaster pool curing and acid use?

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    Isaac-1's Avatar
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    Plaster pool curing and acid use?

    I don't own a plaster pool and have limited experience with them, someone that does not use the internet asked me a question that I don't know the answer to, so I thought I would ask here. Do plaster pools always use more acid than an equilvelant fiberglass or vinyl pool (say two pools next door to each other on the same water supply), or is this only curing the curing phase, if only during the curing phase how long does this last?

    thanks Ike
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    Mod Squad jblizzle's Avatar
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    Re: Plaster pool curing and acid use?

    I think it would only be in the curing phase, everything else being equal. And I usually see it stated it can last up to a year ... but, curious to see if others agree.
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    Re: Plaster pool curing and acid use?

    Curious what chemgeek has to say. I would think it depends on the CSI and the impact the surface has...

    My knee jerk says yes, but I have no empirical evidence.
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
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    JasonLion's Avatar
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    Re: Plaster pool curing and acid use?

    During the first year, yes certainly more acid required for a plaster pool. After that everything should be the same as for any other surface, the pool may or may not require acid depending on the situation.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Plaster pool curing and acid use?

    It also may depend on the quality of the plaster. Well made plaster may cure more quickly or consistently and completely so may stop rising in pH more quickly. Poorly made plaster may not form as solid a surface and may continue to release calcium hydroxide. This can happen if there are surface imperfections creating blistering or calcium nodules. My own pool has some of this which started to show up after around 7 years which is much sooner than it should and indicates an imperfect initial plaster job. Some of it may be due to some settling given it's a new pool, but some of it is clearly rushing the plaster job creating voids. When these nodules started to show up and "drip" on the side of the pool, I noticed the pH rising much more quickly than usual and needing to add more acid than usual. Now in year 10 things have settled down a bit and acid usage is closer to the "normal" relatively small amount needed during years 1-6.
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    Re: Plaster pool curing and acid use?

    Chemgeek - always love your insight. Thank you
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
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    Patrick_B's Avatar
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    Re: Plaster pool curing and acid use?

    +1 on Chemgeeks comment.

    If you really want to dig into this our own member "onbalance" has, in my opinion, one of the most informative websites on the net.

    http://www.poolhelp.com/onbalance.aspx
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