I have a questions about my dishwasher. We just moved into a 60+ year old house on well/cistern water and septic system. We have pretty good pressure at my sink faucet but when I use my dishwasher on hot water it takes approx. 7-8 hours to complete a cycle. Also if I use powder soap with the hot cycle the powder is left on the glasses and some of it is still powdery which leaves me to believe they have not been touched by water. If I use cold water it seems to finish in approx 2-3 hours. This is a 3 year old dishwasher and we were told it worked just fine. Any thoughts on what might be wrong or what to check.