Rotreat Abwasserrreinigung GmbH was founded in 1993 and concentrates on developing and producing membrane filtration plants. Beside the plant technology the RCDT (radial-channel-disc-tube) module system has been invented as an economic and efficient reverse osmosis device for the treatment of waste water. The reverse osmosis plant program is standardised and detached with a capacity from 400 to 50.000 l/h. The system pressure of the plant is usually at p= 90 bar. In the meanwhile the experience is based on various osmosis plants with different water qualities. These plants are positioned internationally. The RCDT technology is successfully purifying worldwide following waste waters.