The Laguna PT510 pond filter accepts the following replacement media:
The PowerFlo 1000 External Biological Pond Filter provides complete mechanical and biological water filtration for ponds up to 4,500 liters or 1,000 gallons in size. This pond filter features a three-tier filtration system includes a top tray with a foam pad for mechanical filtration and a bottom tray for biological filtration (filter not included). This biological filter installs outside of the pond and includes a drain plug and two outlets for creating waterfalls or connecting to a UV disinfector.
PowerFlo 1000 External Biological Pond Filter specifications: