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Perlite, won't it float
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02-06-2009, 10:58 PM
Ron
Senior Member
Join Date: Jan 2009
Posts: 1,285
Don't let the water go higher than the cups, then the perlite won't float out. Even
grow rocks
will float out of the cups if the water goes to high. That is what the overflow pipe is for, to control how high the water rises in the bottles.
Ron
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