oh i see what kind of filter it is. you can rinse it, but if it is to dirty, you should get a replacement cartridge. i would replace it once every month or even multiple times a month. I dont know depends on how dirty it gets. If you do rinse it make sure to rinse it with some of the water from the tank. To get the replacement cartridge, get the filter name and model and go to your local lfs and ask for the replacement.