I made a diffuser that reduces backpressure on the pump so the pump doesn"t have to draw as much power. I wonder if that would help. Basically, you plug the airhose into a 3 in. PVC pipe 4 inches long capped (just drill a hole big enough to jam the barbed fitting in the side of th pipe just below the cap and use waterproof caulking to glue it in). Drill a series of 1/8 inch holes all through the cap to diffuse the air. Place the open end in the center of a metal pie pan and secure it with two small angle brackets. Use three 1 ft. stiff metal straps with holes drilled in each end to secure a 2 ft. piece of 6" PVC to the pie pan so there is about 3 inches between the drilled cap and the bottom of the 6" PVC. Fill the pie plate with concrete. The air rises through the 6" PVC pipe creating a venturi effect. It seems to move more water than my old stone diffusers, costs a lot less, and my pumps (and vanes) last a lot longer.

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