RoyalSoft’s patented Non-Scratch Sapphire Ceramic Rotary Disc’s design incorporates one fixed and one moving disc, which rotates through positions to align channels creating five different fluid pathways. These five pathways, or stages, are: Service, Backwash, Brine & Slow Rinse, Brine Refill, and Fast Rinse. This proprietary design represents a significant advance beyond traditional water treatment system control valves, which traditionally rely on complex valving and a high number of parts that are vulnerable to wear and failure during operation.