Tool for cleaning elbow of the Red Sea nano-filter?

[non-photosynt]

What are you using for cleaning 90 degree tube elbow? Standard flexible brush is too big and won't flex in such a small space. Thanks!

[brent-konieczny]

I would run to the store and buy some small pipe cleaners.

[schaadrak]

Pull a handkerchief through the tube just enough so that it sticks out either end of the pipe. Then move the pipe up and down until you don't see any more crud in the pipe.