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Crappy plaster job. The gunnite is probably showing through.

It's all in the water generally not craftsmanship, When you add water to your pool you need to add metal which lock up particulates and allow the filter to clean them out. Also make sure your main drain is pulling most the water from the pool not the skimmers so particles do not settle out and stain

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โˆ™ 2015-07-14 16:06:46
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Q: Are brown stains or marks common in a newly plastered pools?
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