maintenance and repair of sand filters and related components and accessories, comprising sand filters, tanks, valves, piping and pipe connectors, filtering media, pumps, controls, 5 microns prefilter, pressure distributors, sequencers, pressure gauges, pressure sensors, differential pressure sensors, time delay relays, programmable controllers, electrical equipment cases and terminal levelling supports

Operation of a business engaged in the maintenance and repair of sand filters and other products related; Operation of a business engaged in the leasing of sand filters