Airmax SilentAir LR Series Aeration Compressors are designed to be either a direct replacement for Airmax Shallow Water Series Aeration Systems or the powerhouse behind your own shallow pond or lake aeration project. Consisting of an extremely energy efficient electric motor and long lasting rubber diaphragms, these aeration compressors are capable of aerating ponds up to a 1/2 acre at 6 feet deep with energy costs as low as .52 per month.