*Backflush controller included. Requires (2) D batteries. AC model also available.2 and 3 batteries are standard with polypropylene manifolds, plastic backflush valves and installed drain manifold - requires separate purchase of backflush controller. Minimum pressure for backflush is 30 psi downstream. Other mesh options available. Maximum Pressure: 90 psi. For 91-140 psi, a High Pressure Model is recommended.