Reverse osmosis unit secures screen role

Oxfordshire based Optical Filters makes electromagnetic interference screening systems for displays in military vehicles, tempest monitors and industrial equipment.

When it experienced production problems with its optical screen meshes, a reverse osmosis plant from ELGA Process Water proved a cost effective solution, improving product rejection by about 70%.

Blackened copper mesh screens are made to a high tolerance and the final rinse is critical to quality. In spite of softening the hard mains water, the rinse left streaks on the surface, resulting in a lot of unusable product. ELGA's solution consisted of a selectron softener and carbon filter followed by a MidiRO 750 reverse osmosis unit.

This softens the water, and the membranes remove over 95% of dissolved salts, along with any particulate material and even bacteria.

The five models in the MidiRO range produce 90 to 800L/h of permeate and have a 1µm prefilter.