Well, I haven't had to clean my filter in over 5 years, but I still pre-rinse (yes, I know you're not supposed to need to anymore, but I don't want to risk it),

Well, I haven't had to clean my filter in over 5 years, but I still pre-rinse (yes, I know you're not supposed to need to anymore, but I don't want to risk it), so I check the filter regularly, but it's clean.