Filter Brush is a dense cylindrical bristle brush designed to provide biological filtration and mechanical waste capture in fish pond filter systems. Hung vertically in filter chambers, multiple filter brushes create a matrix of bristles that trap suspended waste particles while providing an enormous surface area for beneficial bacteria to colonize and break down ammonia and nitrite. Easy to clean by lifting and shaking in pond water, filter brushes are a simple, affordable and effective biological filter medium for Nigerian fish farmers.