One of the reasons you were seeing debris at the surface is the diffuser was siting in the light fluffy muck and lifting it to the surface. Muck was probably deep/thick where you had the bubbler&weight. Bubbler needs to be separated from the muck by height/distance (on a frame) or with it lying on a shield/plate. It wasn't because you were using too much pressure and getting too much lift.
tz makes a good point about turning the pond over. One cannot feasibly and completely turn over a pond using short aeration run times. Short run times with just partial circulation and improper aeration can actually do more long and short term harm than provide benefits.
Last edited by Bill Cody; 08/14/13 08:15 AM.
