yasmut, no need to get angry... all he did was link a page... unless the words "but someone else already had the idea." you thought were meant to be mean. I do not think they are that dissimilar. I dont think the co2 entering the top or near the top on the side really makes much difference. And jays design does use a vortex. The main difference in my opinion? jays has the capability to multipass through over and over with the extra pump. Even if not needed, the extra pump becomes a booster to enhance the vortex. With the added pump might be better when your main pump/filter isnt strong enough for a vortex by itself. So both designs use a vortex, with water and co2 comming in the top of the vortex, the current creating the vortex enters near the top and along the side of the reactor, and water with fully dissolved co2 exits the bottom. Other than that the differences are small.
Jay - nice avatar... here is my current avatar on goldfishparadise forums..
And also this one at fastmhz.com forum...
Sorry getting OT