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Should you prefer the upgraded features of the newer models
and helps maintain a natural marine environment in your aquarium
Preserves beneficial bacteria in the gravel bed
Ineffable medium for nitrifying bacteria
Black Knight 4" Dia x 16" Long Filter Brushes - 6 Pack freshwater Should you prefer the upgradedWhat are Black Knight Filter Brushes: Black Knight filter brushes are made from the very highest quality Hydrotek polypropylene twisted into two stainless steel wires to form a cylindrical brush with a loop at one end for hanging. The other end is capped with a plastic knob for safety. They last indefinitely and are the easiest to use, most efficient and most cost effective pond filter medium you can buy. Our brushes are used in filtration systems in