Supra Biological Filter Medium A visibly porous inert medium especially suited to pond filtration. This elimination of pathogens and algae is safe for fish, since the action only occurs within the confines of the lamp area. No light is allowed to leak from the sealed enclosure into the pond, so there is no risk to fish, plants or other organisms within the pond area. All that is required is a clean supply of water to be passed into the unit and then allowed to flow back to the pond by gravity. In most cases the exhaust is used as part of the water fall feature, since the UV sterilizer itself cannot be submersed.
All measurements assume vertical sides and level bottom.
Remember that pools with sloping sides, pools with objects in them, and a partially filled pools have fewer gallons. A special blend of highly activated carbon which provides an economical filter carbon for the pond hobbyist. Removes colors, odors, and poisonous waste from ponds. Out-performs other carbon products which frequently clog and have to be replaced. Removes toxic organic substances, odors, and color from the pond.