The actuator includes an actuator vent (63) in an actuator housing, the actuator vent being connected to a flow switch (65).

The apparatus for elimination of odour is activated for example by a flow switch (17) or an odour sensor (21) coupled to the outlet pipe (8) of the absorption reactor.

The system includes a water treatment filter, a flow meter that coordinates with a flow switch and an electrocatalytic cell coupled to a holding chamber that is attached to an outlet of the cell.

The cartridge includes a body, a bi-directional flow switch, a connector plug, a lid, a printed circuit board, which includes non-volatile memory, and electrically-charged plates or blades.