A filtering assembly for the reverse osmosis water treatment system is
disclosed herein. The filtering assembly encloses the membrane unit in an
air-tight space formed by a membrane unit cover and a membrane unit
housing, both of which could be screwed together and separated apart
easily by an ordinary person without using special tools. After the
membrane unit is replaced, the original membrane unit cover and housing
are re-used to house the new membrane unit. The filtering assembly
arranges its tubular connectors for the pipelines at various vertical and
horizontal locations so that their connections wouldn't interfere with
each other. Additionally, together with the design of separate membrane
unit cover and housing, the pipelines could be installed only once and
the replacement of the membrane unit requires no disconnecting and
re-connecting the pipelines.