Perhaps in the mean time I'll put a gauge on mine and see what it reads, but for anyone smarter than me, how should the pump and pressure react to changing depths?
With nothing but a hose on the pump, the gauge I would guess, would read near zero. When you add the diffusers, but have them on land, the pressure would go up some but not a lot because the only resistance is the diffusers themselves. Now say you put them under a foot of water, the pressure goes up and you get a lot of bubbling. Increase the depth to six feet and what should happen? Will the pressure go up? The pump can only provide so much pressure. Wouldn't a flow meter be needed to see what's actually happening?
