A cleaner system for removing solid debris and contaminants from a feed slurry includes a cleaner operable to separate a feed slurry into an accepted slurry and a reject slurry, the reject slurry including the solid debris and contaminants. The cleaner system further includes a dilution device fluidly coupled to a reject outlet of the cleaner. The dilution device includes a dilution water hydrocyclone having a dilution water inlet, a cyclonic flow section, an underflow outlet at a downstream end of the cyclonic flow section, and a reject slurry inlet in a top of the dilution water hydrocyclone. The dilution water hydrocyclone further includes a flow director disposed between the dilution water inlet and the reject slurry inlet and operable to direct the flow of dilution water from the dilution water inlet in at least an axial direction towards the cyclonic flow section.

A system for purifying a fibrous suspension consists of multiple hydro-cyclones arranged adjacent to one another in a row, each of the hydro-cyclones having at least one feed connection, one accepted stock connection and one reject material connection, and having at least one supply manifold which is connected to multiple feed connections and/or having at least one accepted stock manifold which is connected to multiple accepted stock connections and/or having at least one reject material manifold which is connected to multiple reject material connections, the manifold being elongated and the corresponding connections discharge at their longitudinal side into the corresponding manifold. At an end of at least one manifold which follows the final hydro-cyclone, a fluid or a suspension is guided via at least one flushing connection into or out of the manifold.

A system for purifying a fibrous suspension consists of multiple hydro-cyclones arranged adjacent to one another in a row, each of the hydro-cyclones having at least one feed connection, one accepted stock connection and one reject material connection, and having at least one supply manifold which is connected to multiple feed connections and/or having at least one accepted stock manifold which is connected to multiple accepted stock connections and/or having at least one reject material manifold which is connected to multiple reject material connections, the manifold being elongated and the corresponding connections discharge at their longitudinal side into the corresponding manifold. At an end of at least one manifold which follows the final hydro-cyclone, a fluid or a suspension is guided via at least one flushing connection into or out of the manifold.