We have been in our house three years in January. We live on the southeast side of Indianapolis, IN. Our house was a new house with a new 65 gallon natural gas hot water heater. We have a Kinetico whole house system which was installed about a week after we moved in. Our problem is that our water heater is making loud poping noises. I understand that a build up of calcium in the tank can cause that but our water heater is not quite 3 years old. I'm concerned that we may have to replace it. Got any suggestions?