Johnny,
That is a great idea! My overflow siphon has quit x 2 on me in the past and made for some wet floors. I've been keeping up with it since then, but I never thought of hooking the airline to a powerhead. I'm gonna do that this morning when I get off work.
Templar,
You may try making the airline tube from the overflow to the ph longer or shorter, this will make your ph try harder or less by pulling the air/water through more or less tubing, and should compensate for the slowing of the overflow. Similar in return pumps, the longer your return hose, the harder your pump works to get it through. This sounds good in theory anyway.
[ October 04, 2001: Message edited by: mal ]