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 
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
Last edited by Delphinus; 04-16-2007 at 04:45 PM.
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