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Batch of quickcrete sand


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So i am putting in a stand up pool in my backyard and have been using a ton (literally) of quickcrete sand to level the backyard. On a whim i threw some vinegar on it and saw it froth up. Not like a violent reaction but it definately was a chemical reaction. Is this safe to use in the DSB i'm about to put in my tank?

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Thanks for the PM MDavis.

Looks like anything labeled "playground sand" that passes the vinegar test is good. The quickcrete was for mixing concrete so is allowed a certian level of heavy metals that playground sand is not. Luckily prof had a bunch of sand for cheap so all is good and fantastic now.

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