Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes; water purification systems for commercial and domestic use, water purification system for capturing and filtering stormwater; filtration apparatus, including for the selective removal of pollutants from water; filters, including, water filter and stormwater filters; filtration systems, including water filtration systems; biofilters; apparatus and installations for the treatment of greywater and blackwater; apparatus and installations for the treatment or supply of rainwater, groundwater, and stormwater; apparatus for water treatment, including, water purification, clarification, filtration, desalination and ozination; apparatus for treating waste water and sewerage; apparatus for generating energy arising from the treatment waste water and sewerage; parts of and accessories therefore