Abstract: A washing unit has a receptacle for receiving at least one half of the length of a cylindrical cartridge filter for swimming pool filtration systems. An orifice, disposed in the side of the receptacle, directs water against at least the lower half of the external cylindrical surface of the filter to wash off and entrain foreign matter collected thereon upon flow of the water intermediate the filter and the receptacle. A discharge outlet downstream of the filter discharges the water and entrained foreign matter. An upwardly extending mouth at the inlet of the receptacle accommodates manual insertion, withdrawal and manipulation of the filter during washing while containing water splash. A pair of legs extending from proximate the inlet maintain the receptacle inclined to encourage downward water flow along the filter from the orifice to the discharge outlet.

Abstract: A plurality of geometrically arranged circular depressions are formed in a game board to nestingly receive one or a stack of game pieces. The game pieces, which may be in the shape of discs, are stackable in ascending order reflective of the valuation assigned to each and which valuation is indicated by a raised symbol on the upper surface of each game piece. The lower surface of each game piece includes an indentation configured to mate with a lower valuation symbol formed on the upper surface of another game piece to interlock the game pieces when stacked and regulate the stacking order. To play the game, each of the players is given a set of game pieces. Taking turns, the players attempt to align a specific number of uncovered ones of their game pieces of a common valuation upon the game board and any existing stacks; variations in object and mode of play are contemplated.