A module for ultrafiltration or microfiltration of water includes hollow fibers,
of the type of filtration from outside inwards of the fibers, the water to be treated
being introduced at the top of the module and the treated water being collected
at the bottom of the module. The fibers are arranged inside a housing in multiple
U-shaped bundles, the module being vertically arranged in use with the U-shape
in the top part of the module. At the bottom of the module, each bundle is arranged
in a sheath and individually potted. The sheaths are then urged to be housed in
a distribution plate, and all the sheaths are interconnected by pouring (in reverse
vertical position relative to that of the filtering mode) a potting resin.