I threw out all my Matrix and just put in 10/20 ppi Poret foam and plastic pot scrubbies in my canister a year ago just like the author of the web site above said. Have cleaned my canister twice in a year and now will go 8 months because the media just does not clog and has great flow. Water has been crystal clear for the first time in 10 years. Non planted tank with all fake plants. It works.