This is an ideal solution for small ponds that do not get enough wind or if aeration is required on a constant basis 24/7. This is also a great unit for small lagoon's, septic tanks and other areas where you need aeration.AerMaster LD 4.0 aerates ponds up to 1 acre in size with a maximum diffuser placement of 10' deep! Producing 4.0 CFM of air at 8' deep - while only drawing 2.3 amps of electricity. This system is also very energy efficient! Includes: 4.0 CFM electric aerator, 2 airstone diffusers, a 2-way selector valve, 2 airstone housing buckets, 100' of 1/2" non-weighted airline, 200' of 3/8" weighted airline, 2 duck decoy markers and hose connectors. 2 Year Warranty.