SS, yes the diffusers put in pure oxygen into the water. We use both oxygen and agitator especially with trout because it helps break up Co2 in the hauling tank. The smalelr the bubbles the more transfer you get with the diffuser I recommend point four system. To clarify a surface agitator does put oxygen in the water in the pond. It does this by brekaing up the water and capturing air but does add lots of oxygen in the area. Bottom diffused aeration is more abotu what you refer it moves water...


Greg Grimes
www.lakework.com