Since I've got a BTA now, I want to get some sort of prefilter (foam or otherwise) for the maxi jets. I found this: http://www.reefsplendor.com/pages/pumps/maxijet.html
(look for "maxijet prefilter sponge") but $6/pair seems expensive just for little foam pieces. I will need 4 of them and I'm sure they'll need replacing once in a while.
Has anyone found a better or cheaper solution?