Pond aeration is important in both the winter in summer seasons. During the summer it insures maximum gas exchange and guarantees maximum oxygen levels in the water. During the winter aeration is the most cost effective way to maintain a hole in the ice to permit toxic gases to escape. We offer several models of air pumps to aerate your water garden or koi pond: PondAir 2 and PondAir 4 Airmax® PondAir™ Aeration Kits deliver essential oxygen and circulation to ponds up to 2,000 gallons. … [Read more...] about Pond Aeration For Winter and Summer