I used to use my pump to do the whirlpool method....then I realized it was a pain to clean it. Now I just use my IC wide open and my brew spoon to keep the wort moving as it cools. When I reach temp, I take the IC and hop bag completely out and just get a strong whirlpool going manually with my sanitized brew spoon. 20 mins later, everything has dropped to the bottom. It drains completely clear, and all that's left is lots of cold break that I wouldn't want in my beer anyway.