The Aquascape BioFalls biological filters are positioned to create the beginning of the waterfall in your pond. The filter uses bacteria to break down pond wastes, converting them into less harmful compounds that can be used as aquatic plant fertilizers. So, how do they work? Water enters the biological filter from a skimmer via flexible pipe located near the base of the unit. The water then flows from the bottom to the top of the filter, traveling through filter media and filter pads housed inside the unit. The filter pads remove larger particles, whilst the filter media helps with the removal of fine to medium-sized particles by providing a huge surface area for good bacteria to colonate. As the biological filter fills, it overflows and cascades over its waterfall lip, cascading down rocks that have been set to create a beautiful, natural-looking waterfall. The waterfall creates aeration for your pond, assisting in the circulation and health of the water. Aquascape BioFalls® Filters range in size and can filter ponds up to 22,700 litres. For larger ponds, multiple biological filters can be incorporated into the design. Their durable, rotationally molded, rounded polyethylene shape maximizes structural strength while making them easier to camouflage into your landscape. These filters also carry a limited lifetime warranty.