I am doing some research on data done by controlled studies, and some other concepts to conclusively prove this.

An efficiently designed venturi can provide efficiency off the charts compared to any number of airstones. Also it provides 100% saturation in seconds and penetrates the entire systems water not just the water under the airstones.

drawbacks:

noisy
expensive
hard to make; must be custom-modified for hydro setups in master systems because of pressure issues with pumping upwards to beds
if there is any kind of compromise within the valve itself due to particulates, a possible leak may occur; this can be avoided with certain redundancies

stay posted, i will have your info for you man....:rastasmoke: