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as in waste water treatment plants

2006-09-11 14:40:10 · 2 answers · asked by mhmohr 1 in Environment

2 answers

large aggregate... usually limestone. goes down to sand.. regular old sand..

2006-09-11 14:45:20 · answer #1 · answered by ThisGalRocks! 3 · 0 0

Ditto on above.

;-)

2006-09-11 21:59:41 · answer #2 · answered by WikiJo 6 · 0 0

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