How Do You Make A Homemade Pond Filter?
Building a mechanical/biological filter for your pond is an easy project which can be completed in under an hour, in most cases. Assuming you already have a drill, parts for this project can be obtained for less than $30. Drill two holes in the plastic container using the 1-inch hole saw. One hole should be through the lid, close to center. The second should be through the side, near the bottom of the container. Secure the PVC fittings into the holes you just drilled. Seal them using the silicone sealant. Your hoses for water flowing to and from the pond will attach to these fittings. Insert a filter sponge halfway into each of the two fittings. These are the first and last stages of mechanical filtration. Fill the container nearly to the top with the plastic golf balls. These will serve as a breeding ground for bacteria which provide biological filtration. Leave only enough room at the top for a layer of filter pad. Cut the filter pad to the size of your container, and lay it over the
