Cascade 1500 Canister Filter ImpellerThe Cascade 1500 Impeller replaces the impeller for the Cascade 1500 canister filter. Replacing an old impeller is essential to keep your filter running powerfully and efficiently. Magnetic impeller assembly replacement Fits Cascade 1500 canister filter Includes impeller, shaft and magnet Old impellers can result in decreased water flow, poor circulation, and, in some cases, even an unpleasant grinding noise. Replace the impeller to reinvigorate your