Deluxe Linear Aeration KitRecommended pond aeration for fish over 12 inches. They offer one of the longest warranties of any air pump available because they are the best built air pump you can buy! Never worry about your fish all winter long. As long as you hear the hum of the air pump you can rest assured your fish have a healthy supply of oxygen. Even if the pond freezes over entirely, this unit will still crack the ice at it's weakest point. Usually along the edge of the