Hi, I'm adding a home a few hundred feet downhill (10% grade) from an existing 20 gallon pressure tank system already serving one home. Its using a submersible pump. The well is considered "unlimited" but I have no idea what size pump is installed. What would be the best method to add the additional home to the current system? What size PVC would I run to the new home? Would I need to add an additional pressure tank? etc... Thank you.