I picked up one of these for about 40 bucks years ago, i had two turtles in a 40 gallon, for a while it was "okay" nothing spectacular. But then it would start making this god awful screaming sound and it would stop working. I kept it clean and everything, usually it would need a shake to start working. (it was right next to my bad so it woke me up plenty of times). This continued until one day the thing just died. I took it apart and could'nt find the problem, i also missed my warrenty so! im now the proud owner of a non-functional 40 dollar filter.