Traps leaves, twigs and other debris before they reach your filter. Enhances the use of any suction type auto or manual pool vacuum. Easy open lid for quick emptying without disconnecting hoses. A great accessory for achieving a pool cleaning balance that automatically alternates between skimming and vacuuming with each cycle of the filtration system`s time clock. This versatile in-line leaf canister fits into most typical extension hoses, usually between the first and second link from the skimmer. Traps particles as small as a pea before they end up clogging your pump basket -- keeping your pump running longer at optimum vacuum. A must have for any pool with excessive dirt load