Water purification units; Air sterilisers; Ionization apparatus for the treatment of air; Ozone sanitizers for air and water; Air cleaning units; Air purifiers; Air sterilizing apparatus; Vehicle-mounted air purifying apparatus; Robotic air purifiers for household purposes; Air purifiers for household purposes; Air purifying units for industrial purposes; Air deodorizing apparatus; Ozone generators for air purification; Ozonizers for sanitizing purposes; Germicidal lamps for purifying air