Pond Pumps External Pumps My Favorite Pumps. They are quiet, energy efficient, reliable, and move a lot of water. A built in strainer basket and 2″ unions makes life easy. Click here to learn more Submersible Pumps A Pump by Little Giant that is really versatile. It has a screen to keep small fish and debris out. Click here to learn more A stainless steel pump that is able to pass small solids so that it will not clog easily. A strong pump that works great in skimmers too! Click here to learn more