The AR PRO Systems RO/DI 4040 incorporates a cutting-edge four-stage filtration process to ensure unparalleled cleaning performance. In the first two stages, water enters the 5 micron thread filter and carbon filter, effectively eliminating large fragments and sediment. The third stage involves the RO membrane, which works tirelessly to remove contaminants, achieving outstanding water purity. Finally, the water passes through the DI housing for a meticulous final touch, guaranteeing a total dissolved solids (TDS) level below 10ppm.