We have very acidic well water and in need of a new system for a few years. Honestly, I find the science and all the different systems difficult to compare and understand. It is an important and not cheap investment. At the beginning of 2020 we had EPA install a new system and we could not be happier. Compact, efficient and effective. Mark installed it and has been out for routine service every 6 months. He is meticulous in his work, exceptionally knowledgeable, trustworthy and reliable. I wish I had replaced it all a few years before. Highly recommend EPA Water Consultants