Yea, I know my numbers were a really rough throw it out there to get some air into a fish tank. (Many air diffusers are going to vary depending on how long they have been in since their last cleaning and the rate they clog will vary depending on the pH and mineral levels in the water that might clog them.)
I'm curious, I've seen many discussions about how air stones and air pumps are not very effective means of aeration. (In my deep fish tank it is still fairly effective since it actually does quite a lot to circulate the water around to keep the bottom from becoming depleted.) Raft tanks are shallow and the circulation and bringing bottom water to the surface isn't as effective for aeration since the raft doesn't give much water surface access to air. So the air bubbles from the air stones in a raft bed are really doing the work.
After seeing some of those pictures of the plants right over the air stones and my own experience with small DWC hydroponics and how the air definitely improves growth. I wonder if there are any other more efficient ways to aerate DWC beds. I like the idea of suspending the plants above the water to allow more surface to air contact but this doesn't necessarily work well for operations that need the rafts to float conveyor style to plant at one end and harvest at the other.
Also need to know the fish tank depth as well as type of fish and water temp.
Ryan said:Also need to know the fish tank depth as well as type of fish and water temp.