Posted: Sun Jun 03, 2007 11:10 pm
It depends on how long the stick is and how deep it is in the water. The more surface area on the air wand, the more air volume your pump will need to put out. The deeper the water, the more pressure the pump must generate. Also the size of the bubbles that the air wand is supposed to produce will determine how much pressure the pump needs to be rated at. Finer bubbles require more pressure than coarse bubbles.
A very good air pump for high pressure use is the Tetra LuftG pump. Some of the bigger high volume pumps will work too, but their diaphrams will break if the pressure gets too high.