Filter having vertical filter elements

A filter comprising a vertically disposed filter housing, a support plate, vertical filter elements fixed at their upper ends to the support plate and supported thereby in the housing, a water inlet in the lower portion of the filter, a water outlet pipe passing through the support plate and exiting at the base of the filter, two flanges connecting the support plate to the water outlet pipe in leak-tight manner, one of said flanges being fixed to the pipe and the other flange being fixed to one end of a bellows fixed at its other end to the plate, on O ring interposed between the flanges, and locking clamps disposed inside the pipe and provided to urge the two flanges together, a protective housing positioned around the filter housing, guide rails fixed to the protective housing, and castors carried by the support plate and the upper portion of the filter and being disposed in at least two different planes and movable in the guide rails.