Designed to operate in combination with circulating pumps (Aquamax recommended). Includes 9 watt Bitron UV in lid. Innovative cleaning system using a multipurpose flushing control at the top of the unit. Position 1 allows for normal filtering. Position 2 allows for manual backflush cleaning cycle. 15 cord. 2" threaded connection. 3 yr. warranty. 3/4" to 1-1/2" barb inlet/outlet connections. Filtoclear has 16-ft cord; 2 yr warranty. Choose from 4 models or 3 Replacement Filter Media Kits: Model 800 - OAS56152 - DISCONTINUED AND OUT-OF-STOCKModel 1600 - OAS56151 Model 3000 - OAS56150 - DISCONTINUED AND OUT-OF-STOCKModel 4000 - OAS56932 DISCONTINUED AND OUT-OF-STOCKModel 800 Replacement Filtoclear filter media kit - 0AS56109Model 1600 Replacement Filtoclear filter media kit - 0AS56110Model 3000 Replacement Filtoclear filter media kit - OAS56111Filtoclear UV Bulb9-wat UV Bulb - OAS54984Filtocap Filtoclear Rock Cover - OAS37274 Model 4000