Method for producing a component (1; 101, 104; 204; 301: 401; 501) for a water bearing appliance, comprising the steps of: - injecting from at least one injection point (60; 160) a first not recycled polymeric material into a cavity (56; 156) of a mould (50; 150) for a first time so that said first not recycled polymeric material reaches internal surfaces of said mould (50; 150) and at least partially solidifies to form an external solidified layer (Le); - injecting from said at least one injection point (60; 160), after said first time, a second recycled polymeric material into said mould (50; 150) for a second time so that said second recycled polymeric material fills the core of said cavity (56; 156) and pushes the first not recycled polymeric material not jet solidified; characterized in that said recycled material comprises a polymeric material comprising one or more chemical elements of the group comprising the following chemical elements: Lead; Cadmium; Mercury; Hexavalent Chromium; Bromine; Antimony; Arsenic; wherein said one or more chemical elements are in a quantity inside said recycled material above, or equal to, a minimum threshold, wherein said minimum threshold for Lead is 7 ppm and/or said minimum threshold for Cadmium is 5 ppm and/or said minimum threshold for Mercury is 0.01 ppm and/or said minimum threshold for Hexavalent Chromium is 10 ppm and/or said minimum threshold for Bromine is 5 ppm and/or said minimum threshold for Antimony is 5 ppm and/or said minimum threshold for Arsenic is 5 ppm; wherein said recycled material derives from polyolefin polymers, wherein said one or more chemical elements are in a quantity inside said recycled material below, or equal to, a maximum threshold, wherein said maximum threshold for Lead is 90 ppm and/or said maximum threshold for Cadmium is 40 ppm and/or said maximum threshold for Mercury is 10 ppm and/or said maximum threshold for Hexavalent Chromium is 100 ppm and/or said maximum threshold for Bromine is 100 ppm and/or said maximum threshold for Antimony is 100 ppm and/or said maximum threshold for Arsenic is 100 ppm, or wherein said recycled material derives from styrenic polymers, wherein said one or more chemical elements are in a quantity inside said recycled material below, or equal to, a maximum threshold, wherein said maximum threshold for Lead is 100 ppm and/or said maximum threshold for Cadmium is 50 ppm and/or said maximum threshold for Mercury is 10 ppm and/or said maximum threshold for Hexavalent Chromium is 200 ppm and/or said maximum threshold for Bromine is 200 ppm and/or said maximum threshold for Antimony is 300 ppm and/or said maximum threshold for Arsenic is 800 ppm. - injecting from at least one injection point (60; 160) a first not recycled polymeric material into a cavity (56; 156) of a mould (50; 150) for a first time so that said first not recycled polymeric material reaches internal surfaces of said mould (50; 150) and at least partially solidifies to form an external solidified layer (Le); - injecting from said at least one injection point (60; 160), after said first time, a second recycled polymeric material into said mould (50; 150) for a second time so that said second recycled polymeric material fills the core of said cavity (56; 156) and pushes the first not recycled polymeric material not jet solidified; said recycled material comprises a polymeric material comprising one or more chemical elements of the group comprising the following chemical elements: Lead; Cadmium; Mercury; Hexavalent Chromium; Bromine; Antimony; Arsenic; wherein said one or more chemical elements are in a quantity inside said recycled material above, or equal to, a minimum threshold, wherein said minimum threshold for Lead is 7 ppm and/or said minimum threshold for Cadmium is 5 ppm and/or said minimum threshold for Mercury is 0.01 ppm and/or said minimum threshold for Hexavalent Chromium is 10 ppm and/or said minimum threshold for Bromine is 5 ppm and/or said minimum threshold for Antimony is 5 ppm and/or said minimum threshold for Arsenic is 5 ppm; wherein said recycled material derives from polyolefin polymers, wherein said one or more chemical elements are in a quantity inside said recycled material below, or equal to, a maximum threshold, wherein said maximum threshold for Lead is 90 ppm and/or said maximum threshold for Cadmium is 40 ppm and/or said maximum threshold for Mercury is 10 ppm and/or said maximum threshold for Hexavalent Chromium is 100 ppm and/or said maximum threshold for Bromine is 100 ppm and/or said maximum threshold for Antimony is 100 ppm and/or said maximum threshold for Arsenic is 100 ppm, or wherein said recycled material derives from styrenic polymers, wherein said one or more chemical elements are in a quantity inside said recycled material below, or equal to, a maximum threshold, wherein said maximum threshold for Lead is 100 ppm and/or said maximum threshold for Cadmium is 50 ppm and/or said maximum threshold for Mercury is 10 ppm and/or said maximum threshold for Hexavalent Chromium is 200 ppm and/or said maximum threshold for Bromine is 200 ppm and/or said maximum threshold for Antimony is 300 ppm and/or said maximum threshold for Arsenic is 800 ppm.