scales
A couple of years ago I built a 30 gal. for my truck w/ an 1100 pump. But herring scales clogged up the pump.
Fixed it by putting a whiffle ball over the input to the pump and snap tied a lint filter thing for clothes washers that I got at Benny's around the whiffle ball. (Imagine plastic mesh stuff shaped like a condom wrapped around a whiffle ball!!) It spreads the scales over a large area so just water gets through and it runs for hours without clogging.
If you make one, and you put herring in it (or just about anything else with scales), then you'll have to deal with the scales.
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