I was reading that it is a wise idea to clean the tubes for your filter as they could clog causing less of a flow. So... how often should they be cleaned?
I would only clean them if you see they need to be done, if you notice less flow or clogged. I have had my Eheim runnning for 5 years and have never had to clean the tubes yet.
Another time would be when you see junk coming out.
I rinse out the tubes in my HOB filters once every few months, just to flush out the big chunks :P but have never cleaned the tubing for my Eheim.
I clean mine when I can't see through them anymore ;D
Thanx everyone! That answered my question.