The only part of the filter which needs air are the biological parts (jap matting and flocor) possibly in the foam aswell unless this is being used to catch fine particles in which case it wouldnt work. A 50ltr pump will be a bit big for that filter so you might be as well getting a 20 ltr pump, unless you plan to T the excess air off to the pond.
Posted on Aug 21, 2005, 8:50 PM from IP address 82.38.196.144