Nelsen Arsenic Reduction Systems  feature the proprietary Nelsen 7000PID Arsenic Reduction Control Valve and LayneRT adsorption media. The 7000PID is a non-backwashing controller programmed for the specific water chemistry of each installation. The controller indicates the capacity of the system and the remaining safe levels of media adsorption. LayneRT is a proprietary, durable, arsenic-selective media, developed as a significant improvement on the efficiency and longevity of traditional arsenic media. It is a high-capacity technology that effectively reduces arsenic to safe levels without wasting water or sending wastewater back into the environment through the drain. These systems are designed to reduce arsenic to less than 0.010 mg/L.