and outflow opening 42 defined in schematic drawing of fig2 and holes 124 and 126 are formed in the sheet portion 116 so as to respectively define a top opening and a bottom opening corresponding to openings 26 and 28 illustrated in schematic drawing fig2 referring to fig4 it can be seen that the portion of the channel 120 between the bottom edge of hole 122 and hole 126 forms a water inflow and solution outflow passage corresponding to passage 40 in schematic fig2 and the portion of channel 120 between the upper edge of hole 122 and the top hole 124 defines an air inflow and outflow passage corresponding to passage 36 illustrated in schematic fig2 the overlapping parts of sheet portions 114 and 116 to either side of channel 120 are suitably heat sealed together prior to heat sealing both of the top and bottom edges of the dispenser a block of soluble cleaner material must be inserted in the central portion of the dispenser defining the cavity 12 the inventor has is found that if the diameter of the cavity 12 is 1 62 inches the height of the hole 122 is 9 16 inch the distance from the sealed edge 112 to the bottom of the hole 122 is 4 inches the volume of the cavity below the hole 122 is 92 milliliters and a 11 2 ounce block of calcium hypochlorite cleaning material is inserted in the cavity 12 then the dispenser will dispense sufficient calcium hypochlorite.