The 1/2, without checking again, has about 4 cfm's vs. the 1/3 having about 2?
The Vertex diffuser is at 11 ft right now, the airstone is at 8, and the new Vertex diffuser would replace the airstone.
Ted Lea's site is down and I ordered some new hose the day it went down, and just about pulled the trigger on the 1/2 HP at that time. Wish I would have.
