Water Pressure or PSI (pounds per square inch) is exactly that – a measurement of force. While water volume or GPM (gallons per minute) is a measurement of flow. In most cases, plumbing systems that deliver unsatisfactory performance have a volume problem not a pressure problem. The pressure is most often adequate – it is the pipes that are either undersized, corroded & restricted – or both. In many cases there is excessive water pressure and still symptoms of poor water volume delivery is present. Too much water pressure can cause a host of problems. Similarly, high blood pressure can go undetected or undiagnosed for years while the negative effects and irreversible damage occurs. A simple water pressure measuring device can be purchased at most hardware stores for under $15! Eighty (80) PSI is considered high – anything over and you’re asking for trouble!