I use a 42 gal Brute Buster. Rule 17A washdown pump....but the key is the size of the overflow. I use a 3" hose, I think it is hose for sanitary use, looks a bit corrugated I had it lying around. The barrel is tall enough to go over the gunnel. Lots of water exchange.
I was thinking of making a custom fiberglass 50 gal oval but just haven't got to it yet.
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