Watts Pure Water has introduced its new M-Series Tap Water Reverse Osmosis Systems. The M-Series is a line of commercial water purification systems designed to utilize the latest in low energy membrane technology by using the highest production membranes available. Models are offered in sizes from .33 gpm to 10.5 gpm. The M-Series systems feature stainless steel membrane vessels and front panel, low energy TFC membranes, panel-mounted flow meters, low voltage electronics, liquid-filled pressure gauges and a low inlet pressure switch. Watts Pure Water.