PURPOSE: To contrive cost reduction by enabling the increase and decrease of filter equipments and stands, by providing each filter equipment equipped with a bottom plate having a standardized size on a common stand, of which the shape and dimension are standardized, in a freely detachable manner through the bottom plate.

CONSTITUTION: Filter machines 1, 2 each having a standardized same shape and size are arranged on a standardized common stand 3 in a freely detachable manner. The stand 3 is assembled in such a way that long members 4, 4' each having an L-shaped cross-sectional area and a long member 5 having an inverted T-shaped cross-sectional area are arranged as shown in the drawing and connected to a base frame 7 through pillars 6 in a freely detachable manner by screwing means. By assembling the stand 3 by interposing 1Wplural members 5 between members 4, 4', the number of the stands 3 can be easily increased and decreased if necessary. Standardized bottom plates 1', 2' each having the same shape and dimensions are mounted to the lower parts of the filter machines 1, 2 and the bottom plates 1', 2' are fixed to the protruded base plates 4a, 4'a, 5a of the members 4, 4', 5 in a freely detachable manner by bolt clamping.