I love that the cartridges are more carbon than particulate filters, because we do not need particulate filtering. I was disappointed that electricity was required, but realized this is the price to pay for more space under the counter. We live in a rural area and our house is very quiet so the sound is very noticeable. I really wish I could trade the electricity on your unit for a pressure tank. Is that possible? I understand you have a small tank to raise the pressure for a refrigerator line, but I'm sure the electricity will still be required. Is it possible to add a pressure tank that will remove the need for electricity?