HWT Engineering Solutions (PVT) Ltd. Sri Lanka is a partner company of Pneumetic (PVT) Ltd. Maldives has operating experience with reverse osmosis technology has improved over the past 15 years. All our plants in Maldives and other countries have long-term operational guarantee from our expert service team who have trained under our supervision. Assuming that a properly custom designed and constructed unit is installed, the major operational elements associated with the use of RO technology will be the day-to-day monitoring of the system and a systematic program of preventive maintenance. Preventive maintenance includes instrument calibration, pump adjustment, chemical feed inspection and adjustment, leak detection and repair, and structural repair of the system on a planned inspection schedule.

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The main operational concern related to the use of reverse osmosis units is fouling. Fouling is caused when membrane pores are clogged by salts or obstructed by suspended particulates. It limits the amount of water that can be treated before cleaning is required. Membrane fouling can be corrected by back washing or cleaning (about every 4 months), and by replacement of the cartridge filter elements (about every 8 weeks). The lifetime of a membrane in Maldives has been reported to be 2 to 3 years, although, in the literature, higher lifespans have been reported.

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Operation, maintenance, and monitoring of RO plants require trained engineering staff. Staffing levels are approximately one person for a 200 m3/day plant, increasing to three persons for a 4 000 m3/day plant.