The DHP's impeller design allows it to resist blockage and pass 1/4” debris without clogging the pump. Clean your pond - not your pump! These pumps are energy efficient and are capable of powering filters, waterfalls, and streams. They are also oil-free, so they will not contaminate aquatic life. For maximum flow use 1 1/2” ID tubing. Also fits 1 1/4” ID tubing. UL listed. Includes a 3-year limited warranty. 15 foot power cord.