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filters, snails and impellers
I find that I need to provide some sort of mechanical filtration or else
my powerhead inlets become plugged with plant debris. I used to just use
a plastic grill but this allowed the pumps to plug after a week or two.
Once a snail did get into an impeller pump; it didn't damage the pump
but it did make a strange noise until I figured out where it was coming
Steve Pushak Vancouver, BC, CANADA