THE PONDMASTER CPF SERIES PRESSURIZED FILTERS are ideal filtering systems for small to medium ponds and water features. They've 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 UV Clarifier models help clear ponds of green water algae.o Detachable Hose Assembly Module allows Quick Shutoff and Easy Disconnection of Hoses for Faster, Easier Filter Maintenance. o Large Capacity Housing and Reusable Biological and Mechanical Filtering Material Help Maintain a Healthy Environment for Your Fish and Aquatic Plants o Biological Media Offers Tremendous Surface Area for Beneficial Bacterial Growth - Never Needs Replacing o Reusable Foam Filter Pad Provides Effective Mechanical Filtration o Available UV Clarifier Models Help Reduce Free Floating Algae in Pond Water o Heavy Duty Weather Resistant ABS Plastic Housing Can Be Buried for Inconspicuous Installation o Maximum Efficiency and Minimum Power Consumption When Used with Pondmaster Magnetic Drive Pumps o Ideal for Small to Medium Water Gardens, Barrel and Container Ponds o Can Also Be Used as a Trickle Filter for Small WaterfallsFor Med Sized Pond Filtration.