Reverse chromosis systems from the Fatro Duo line are double-stage systems with a high salt retention rate and yield. Optional membrane degassing ensures low conductivity and additional stable quality. The Fatro Duo systems designed by Frei AquaService AG are developed for professional use, efficiency, quality, environmental and service friendliness. This has the advantage that these systems can be operated extremely economically. The latter also has a positive economic effect, as the investment is amortized more quickly. Fatro Duo reverse osmosis systems are CE-compliant and exceed national guidelines.