I use this filter for my 150qt cooler. Get the replacement filters from amazon. It almost does too good of a job though, it filters the chemical from the Finer Shiner. Keep the water cold and you shouldn't have any problems. My wife feeds mine (she says they're hungry) so i gotta change the water and filter about once a week, anyhow. If you dont feed them you will get much better service out of the filters. I just spray the filters off with a water hose and reuse a couple times before swapping with a new one.