I decided to completely clean my canister this weekend, I routinely change the filter pads & carbon monthly, but I always wondered about the hoses, intake, etc. I have cascade 1000, the hoses are a black color. I got the 66 inch long brushes from amazon Saturday, decided to tackle it today. Them hoses were so gross & only after 6 months, it was like that slimy stuff on the inside of HOB, but 3x worse, this was all through that black hose, but thick. So, it took me and my daughter about 2 hrs to totally & throughly clean all hoses & attachments, intake, impeller everything. I keep cleaning the hoses until the water ran clean. Now this is my first canister filter, I’ve mainly used HOB’s and once had trickle filter- (that didn’t last long). HOB’s are easy to clean & change cartridges, no gunk ever built up in my HOB as nasty as this stuff. Cascade Filter seems to run much better, Do canister filters hoses and such get like this all the time?