Fred,
I have a well that is only used for filling my pool and watering the lawn etc. I have city water for the house. I just bought the house and the pump on the well does not have an expansion tank. The former owner said that without that the water always needs to be running if the pump is on. Is it possible to add an expansion tank or does the pump need to be replaced? How much would this cost for this installation?

Thanks,
Glenn