Tough to think of a title for the thread on this one lol. I have a quick question about canister filters. I've noticed on the 3 I've used so far that they all have a ball in the outlet that keeps water from siphoning back if there's no pressure pushing it up. I understand how that works and all, but I don't know why it's necessary. I ask because I recently acquired a second hand filter that works like a champ, but the ball inside is making quite a racket just from banging around it's little ball holding area :lol: . I've tested another filter I have previously without the ball, because it had dropped under the washing machine without my noticing.. lol. Anyway I didn't have any problems with it, but I never did use it like that other than overnight testing in the garage. If I were to remove this ball from the filter to get rid of that noise would I be removing an important mechanism in the filter?