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Old 09/01/2015, 01:11 PM   #1683
RC Mod
Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 87,263
The dinoflagellates should die if exposed long enough to fresh water. I don't know what the time limit might be, though, and I'd expect a few to survive here and there. Rinsing the sand might remove some detritus. I'd be tempted, though, to soak the sand in RO/DI with a powerhead and check the phosphate level after twelve hours or so, to see whether the sand is leaching a significant amount of phosphate.

Jonathan Bertoni
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