Chlorinating units for water treatment; Electrolytic water generators for electrically decomposing tap water to generate electrolytic water and for removing chlorine odor from tap water; Filters and filtering devices for air and gas conditioning; Purification installations for sewage; Sewage purification apparatus; Sewage purification installations; Swimming pool chlorinating apparatus; Waste water purification apparatus, installations and tanks; Waste water purification units; Water purifyin...