Pond Boss Forums INTRO Questions & Observations Diaphragm Pump for pond aerator questions.

I'm using a Gast DOA-P701-AA 1/8hp linear diaphragm pump. Its rated to 30 ft. Dont remember exactly what the PSI rating is, but at approx 9ft deep, its putting out a lot of air thru a double tubuler rubber membrane diffuser. We've estimated my little pond gets turned over once every 3 hours using the minimum lift calculation of the smallest diffuser Vertex sells (it's not a vertex diffuser tho).

Something else to consider is the type of diffuser and whether it has a built in check valve of some design to prevent water from filling the air line when not in use. If the pump is having to clear the line upon startup, its experiencing excessive back pressure on the pump and will shorten it's working life. Luckily, diaphragm pumps are supposedly easily rebuit.