Brushes can be used as a filter system..the filament traps the particcles removing them from the fluid.the brushes can be cleanedand re-used.
pond filter ibrush s the best way to keep your gutter flowing.it is inserted into the gutter.and it is an effective protection against debris,leaves,seeds and nests etc.in the roof.with the bristies layout,only rainwater can penetrate these areas.