Needlewheel to Meshwheel skimmer mod

[Delphinus]

The problem there is that the backpressure of pushing air through the wooden airstones is hard on the diaphrams and they stretch out and lose their effectiveness after a while. In this case you'd be pushing air into suction anyhow so it should be OK. Having said that though, I don't know what a typical air pump pushes in terms of litres per minute. It could be that you still need a spendy-ish air pump just to get the requisite volume of air moving into the skimmer. I don't know, but I can assure you I'm wasting my time here at work looking into this very thing as we speak