return water supply tube 20 connected to the pool via a plurality of inlet tubes 23 for return of cleaned water from the gutter to the pool the perimeter skimming gutter of fig3 is similar to the perimeter skimming gutter of fig1 and thus again like numbers are used for like parts the gutter in this case includes a removable upper channel 30 connected via overflow ports 31 to a second gutter channel 34 below and which accordingly comes into use only when channel 30 39 s capacity is exceeded the perimeter skimming gutter of fig4 includes a wall covering 8 including a base 11 formed of a strip of pvc backing and in lieu of the tile facing as in the facing surface arrangement 8 of fig1 3 instead includes a plastic non skid nylon reinforced vinyl sheet 17 applied to the pvc backing strip in each of the embodiments of fig1 4 the facing surface is attached to the base of the wall covering independent of the attachment of the base of the wall covering to the gutter wall in each of the preferred embodiments shown in fig1 4 the facing surface is adhered to the base the perimeter skimming gutter of fig5 includes a wall covering 8 that has a pvc gutter bar grating 18 as the facing surface in lieu of the tile facing another difference is that the pvc gutter bar grating 18 does not require a base 11 embodied as a back support as shown in fig1 3 but rather.