I've been having some trouble recirculating wort during the last 15 minutes of the boil. Some of you would have seen me trying to figure out what was going on at the last Mash Occur.
I have a second valve on the outlet to help with priming issues, and this usually works just fine, but sometimes, the pump just doesn't seem to have the power to pump the wort back up to the top of the kettle. Turns out this is cavitation caused by the bubbles from the boil.
The only reason I'm pumping during the boil is to sanitize the pump, tubing, and whirlpool arm. I'm thinking that restricting the outflow may help. If not, anybody got any other ideas?