Thank you so much for your reply. We have good hot water pressure so the hot water heater is OK.
The cold water is giving us the problem. We have cut the line that comes into the house and the pressure is good there. Also from there the line goes into a toilet and a sink in one bathroom and the pressure is good there. Then it makes an elbow turn and goes to the rest of the house where the pressure is bad. Could it be in that elbow? We have blown the lines out with air and got a lot of the mineral deposits out. They are coming from our water well. But we think the problem is in that one spot. Thank you.