loc nar is right. I've done more research, and also this venturi concept is so sophisticated already not to mention me trying to adapt it to make less noise and maximize the oxygen delivery.

I rushed to judgement when I used the word obsolete or even criticized airstones. Airstones are very effective and sometimes I get ahead of myself with all my freaking research. I like the concept of the venturi, but I dont have enough experience yet.

good luck