We installed a reverse osmosis filtration system 12 years ago. Sami of The Water Store has changed the filters semi annually faithfully for years. The cost is $ 110.00 every six months. The system has needed no maintenance(this year he adjusted the air pressure in the under the sink tank for better flow for the first time). Initially we were on a well — now we are on City water which was forced upon us due to development in the area. I didn’t like the idea of drinking reclaimed, chlorinated water at all. We have clean clear water with a minimum of fuss. Sami is a certified member of the Water Quality Association — CWSVI.