The stack of spacers, end-blocks, a

The stack of spacers, end-blocks, and endplates are sealed inside a fibreglass-reinforced plastic cylinder by O-rings on the periphery of the end-blocks (analogous to the end-caps in an RO vessel). The module is therefore guaranteed to be leak-free at an operating pressure of seven bar. Higher pressures may bepossible, since the operating pressure is limited only by the effectiveness of the end-block, O-rings and the pressure rating of the cylinder and the endplates. The new module combines the superior flow distribution of a plate-and-frame design with the benefits of a cylindrical housing.