11 Water treatment, filtration and purification apparatus and installations including filters, chlorination apparatus; installations for the treatment of water used in swimming pools; pool and spa heaters, water heaters and coolers; swimming pool and spa equipment in this class, namely, installations for heating swimming pools and spas, water conditioning apparatus, water supply and recirculation apparatus; jet nozzles for generating massage currents in spa baths; lights; lighting installations including fixed underwater lighting installations