I use them mainly to fillter out the small snails that run rampant in my tanks and this keeps them from going into my pumps and cloging up my impellers.
I use the mesh ones and just rince them out when I do a water change.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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