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Any idea why this would foam like this during the whirlpool? This is the Funktown APA.

Air got in somewhere, loose fitting? Should be OK.

Might be an interesting hot side aeration experiment. Would be interested in how it turns out. There's a lot of controversy on the subject. Thought to be important, but not very important?

That explains it. Noticed a loose cam going into the counter flow, didn't leak but 1 arm was half open.