An appliance diverter water valve for pumping water having filamentous contaminants, the diverter water valve comprising: a housing defining an enclosed volume and having an inlet channel for receiving water and aligned along an inlet axis and having multiple outlet channels (22a, 22b, 22c) aligned along axes parallel to the inlet axis; a spool positioned in the housing between the inlet channel and the multiple outlet channels (22a, 22b, 22c) to rotate about the inlet axis, the spool having a tubular spool channel having a first end aligned with a proximate end of the inlet channel and a second end aligned with individual proximate ends of the multiple outlets as the spool rotates; an electric motor operating to rotate the spool; and a position sensor distinguishing a position of the second end of the spool channel alignment with individual proximate ends of the multiple outlet channels (22a, 22b, 22c); wherein the spool channel when aligned with a proximate end of a given outlet channel of the multiple outlet channels (22a, 22b, 22c) provides inner channel walls that are substantially continuous with inner walls of the inlet channel and inner channel walls of the given outlet channel; an elastomeric seal rotatably connecting the inlet channel to the spool channel; wherein an upper surface of the spool abuts a plate supporting the multiple outlet channels (22a, 22b, 22c) to provide a sliding seal against the plate with rotation of the spool and wherein the spool is elastically biased upward into sealing configuration with the plate; characterized in that, an interface between the upper surface of the spool and the plate is free from elastomeric seals; and wherein the spool includes a radially-extending flange deflected upward by a rim on the housing to provide an elastic biasing upward of the spool against the plate in sealing configuration. a housing defining an enclosed volume and having an inlet channel for receiving water and aligned along an inlet axis and having multiple outlet channels (22a, 22b, 22c) aligned along axes parallel to the inlet axis; a spool positioned in the housing between the inlet channel and the multiple outlet channels (22a, 22b, 22c) to rotate about the inlet axis, the spool having a tubular spool channel having a first end aligned with a proximate end of the inlet channel and a second end aligned with individual proximate ends of the multiple outlets as the spool rotates; an electric motor operating to rotate the spool; and a position sensor distinguishing a position of the second end of the spool channel alignment with individual proximate ends of the multiple outlet channels (22a, 22b, 22c); wherein the spool channel when aligned with a proximate end of a given outlet channel of the multiple outlet channels (22a, 22b, 22c) provides inner channel walls that are substantially continuous with inner walls of the inlet channel and inner channel walls of the given outlet channel; an elastomeric seal rotatably connecting the inlet channel to the spool channel; wherein an upper surface of the spool abuts a plate supporting the multiple outlet channels (22a, 22b, 22c) to provide a sliding seal against the plate with rotation of the spool and wherein the spool is elastically biased upward into sealing configuration with the plate; characterized in that, an interface between the upper surface of the spool and the plate is free from elastomeric seals; and wherein the spool includes a radially-extending flange deflected upward by a rim on the housing to provide an elastic biasing upward of the spool against the plate in sealing configuration.