Aquarium filtration apparatus, not for the fishery industry; desalination plants; distillation apparatus; distillation columns; filters for drinking water, filters for water and air filtering installations (parts of household or industrial installations), flushing apparatus, flushing tanks; purification installations for sewage, including those for household purposes; refining towers for distillation; regulating and safety accessories for water apparatus; sanitary apparatus an installations; sterilizers for water purifying apparatus and machines; stills; water distribution installations; water filtering apparatus; water flushing installations; water intake apparatus; water purification installations; water purifying apparatus and machines; water softening apparatus and installations, water sterilizers for water purifying apparatus and machines; water supply installations; water pipes for the aforementioned apparatus and installations