So what we've done, remove all the grates, and drill a hole about 1/3" below the impeller, and stick a welding rod through it. That turns your jet into a weedeater, you'll get a little hesitation, then it'll cut it up and you're good to go. It does allow the occasional oyster shell to get into it, which will shut you down. I carry a piece of grounding rod to just bash the shell into pieces and out it comes.