Air purifiers; household air cleaners; filters for air purifiers; filters for household air cleaners; ionizers for the treatment of air; industrial air purifiers; air purifiers for automobiles; electric humidifiers for household use; dehumidifiers for household use; water purifying apparatus and machines; filters for water purifiers; water softening machines; filters for drinking water; filters for use with apparatus for sanitary purposes; filters for use with apparatus for water supply; bidets; bidet filters; filters for industrial installations; filters for electric humidifiers for household use; electric sterilizers for household purposes; electric clothes drying machines for household use (heat drying); filters for dust; laundry drying machines (electric); sterilizing apparatus; filters for sterilizing apparatus; air deodorising apparatus; filters for air deodorising apparatus