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.