Cecil, bottom diffusers are only 10-20% efficient at transferring oxygen directly to the water, where Kasco surface aerators are about 50% efficient. However, the deeper the water the more effective the bottom diffusers become. Many people are ill advised on the effectiveness of bottom diffuser systems in shallow water.
Jeff, Kasco has 3 sizes of surface aerators. The 1/2HP draws 5 amps @115 volts at start-up, and running amps are about 60% of that. The 3/4HP draws 6.7 amps @115 volts at start-up, and running amps are about 60% of that. The 2HP draws 11.0 amps @230 volts at start-up, and running amps are about 60% of that. Volts x Amps = Watts. Watts x 1000 = Kilowatts. Kilowatts x running hours = Kilowatt hours. Kilowatt hours x your local rate = cost.
Mike Robinson
Keystone Hatcheries
