The Craft Brew Water 850 GPD System comes compete with UV, Blending Valve and TDS Meter. All this in a compact design, the 2 GPM UV sits on top for easy maintenance. The 850 GPD system comes in 10 configurations, float switch controlled, pressure switch controlled, pressure switch controlled or Stacked on top of 62, 82 or 120 gallon Pressure Tank. Also GAC or Cat Filtration depending on your needs.