20 comprises a central hub 39 mounted on a screw 38 a mounting bracket 34 and a pair of radiating blades 42 which are placed equidistant and axially about hub 39 and twisted so that each blade 42 forms part of a helical surface that is pitched with respect to the shaft axis agitation member s 20 can optionally be removed from vacuum head 10 and replaced with port cover s 40 shown in fig4 mounted by a screw 38 thereby eliminating flow of suctioned water through port s 18 annular flange 43 extending from the upper surface of cover 40 mates with a corresponding groove 41 peripheral to each port 18 on the underside of partition 16 to facilitate sealing and to concentrically align each cover 40 with each port 18 in use suction conduit 14 is coupled to an external vacuum source and head 10 is submerged in a water filled pool to rest on the floor 36 of the pool below water level vacuum head 10 is made to move along surface 36 by means of lateral pressure exerted by the user on handle 52 downwardly extending bristles 32 62 contact surface 36 with their tips and provide a means of support for vacuum head 10 as well as a scrubbing action effecting removal of material adhered to or settled onto the wall 39 s surface vacuum applied to suction conduit 14 causes water surrounding head 10 to flow between each of the bristles 32 62 into the area defined by projecting lip 26 of casing 12 where it exits the pool via conduit 14 the water flowing under the influence of the applied.