Designed to remove suspended sediment and solids from water when system turns on, can run intermittently. Easy-to-clean filter pads help remove debris from water before it enters the pump to help extend pump life and keep fountain head/water feature fromclogging. Includes 2 debris filters with easy-to-connect adapter. Compatible with Nos.566631, 566632, 566633, and 566657 pumps. Corrosion and UV-resistant.