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well sand is a very dense substance most stuff wont get in the sand it will settle on the top. A nything in the sand your clean up crew should take care of. Come to think of it I dont think to many SW people gravel vac to much since the sand and rock and clean up crew all take care of it all.
when i vaccuum my sand which is mostly course but partly fine I tie a not in the tubing of the vacuum to decrease the power of the vacuum. I still get a small amount of sand that gets removed but is not very noticable unless your sand bed is very thin. Hope this helps.