When our pump cycles on, we get a water hammer effect close to the area of the pressure tank. I would appreciate any suggestions in how to diagnose the problem. The pressure tank is relatively new; I replaced it about a year ago. We have a water softener system in place; resin, carbon, brine tanks as well as a 200 gal "chlorine contact" tank. The system as about 3 years old and has been functioning fine. We do have quite an old water heater; probably about 20 years old and it does not have a relief tank installed on it. I given you all the information that I think of of the top of my head, thats why I need your help. The water hammer is a symptom that I need to find the cause of. thanks for any help. Steve.