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I'm guessing bio film is the light brown slimy stuff? I used to notice my old canister filter hoses would always spew a bunch out when I turned it back on.Aside from a thin bio film I have never seen anything grow or build up in the plumbing.
The flow is too high for anything to cling on and with lack of light basically nothing grows.
Not exactly, they are nothing more than a film/coating on the inside. They dont grow into a thick chunk that could block the flow of the pipe.I'm guessing bio film is the light brown slimy stuff? I used to notice my old canister filter hoses would always spew a bunch out when I turned it back on.