Hi, System is as follows: well 400ft. 2 pumps one in the well, one on the surface for delivery of water to house. 5000 gallon storage tank. 2.5HP ITT Industries centrugal pump. Motor by baldor. (surface delivery pump). 40 gal pressure tank. Lense microprocessor controlled motor drive unit. Densco transducer pressure switch. 0-160 psi. system is 9 years old. The problem is that we would like to increase the pressure at the house. Pressure at the house is around 55psi after all the filters. We would like to increase it but the surface pump seems to max out at 67-68psi. The house is about 350ft from the well. Can we increase the pressure to 72-75psi at the well? Is that possible? Is our pump wearing out? water quality: TDS: 1200 ph 7.3 Hardness 35 GPG Silica 49.7 mg/l TDS, hardness, silica is extremely hard on all of the equiptment.