Originally Posted by hoppycalif
What does the sponge do? Don't you get the fine bubbles just from running the CO2 through the impeller? It is sure hard to beat the price on this!
If you have the sponge on the bubbles will float to the surface pretty much right above the reactor. If you take it off the bubbles fly all over the place. I orginally had the sponge on with the bubbles floating up to the output on my canister filter, but I ended up taking the sponge off and it seems to do a better job with increasing co2 levels.