I use a Tunze ATO pump you do not need much flow When that goes out I might switch to a different pump but not sure it would change anything. My degassing chamber is a section of 4" PVC that has a air stone at the bottom. That over flows into a 5 gallon water can that has a high/low tank controller hooked up on it upsidedown to remove water with the tunze pump to the DI resin.
