The ECO II is straightforward in its construction and works entirely without an electronic control unit, delivering a separation rate of 99.3%. The entire device is replaced after about a year. The ECO II is suitable for anyone looking for an easy-to-maintain, cost-effective alternative to electronically controlled centrifugal systems. The ECO II can serve up to 3 dental units, while the ECO II Tandem can serve 3 to 5 dental units.