The CPF-2000 compact pressure filter are perfect filtering systems for small ponds and water features. They have been designed to reduce required maintenance while establishing a healthy environment for fish and aquatic plants. This integrated system can be conveniently located in or near a pond or patio container. The available UV clarifier models help control green water. Large capacity housing with reusable biological and mechanical filtering material helps maintain a healthy environment for your pond fish and aquatic plants. Biological media offers tremendous surface area for beneficial bacterial growth-never needs replacing. Reusable foam filter pad provides effective mechanical filtration. Maximum efficiency and minimum power consupmtion when used with Pondmaster pumps. Ideal for small to medium water gardens, barrel and container ponds. Can also be used as a trickle filter for small waterfalls. Designed to work with most pond pumps. 1800-GPH pump size. 1-inch inlet and 3/4-inch outlet inside diameter.