how often

valdok

Large Fish
Jul 1, 2003
229
0
0
40
Chicago, Illinois
val.textdrive.com
#3
Anywhere from every month to 6 months, depending on what type of filter. Generally canister filters are changed twice a year, and regular over-the-back filters tend to need more changing. It should say in your manaul for your filter the suggested time period for a filter medium before changing.
 

Somonas

Superstar Fish
Oct 22, 2002
2,061
0
0
46
O-town
www.myfishtank.net
#4
Twice a year for canister filters !?

Well.. I suppose on a low stocked tank
I just finished cleaning my 2 out. and I think I did it a month and a half ago. Water in the bucket looked like black coffee. yuck.