May I know which sands to use? Left is silica sand for pool filter and right is construction sand (strained myself). The construction sand has a smell. My place has no playsand

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May I know which sands to use? Left is silica sand for pool filter and right is construction sand (strained myself). The construction sand has a smell. My place has no playsand

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What is the difference between sand water filter & water filter that has a top layer with rock then eventually smaller sized rocks then sand? - Quora

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