Ion Exchange [India] Ltd supplies Counter Top Reverse Osmosis Drinking Water Purifier. Ion Exchange [India] Ltd. Is ISO 9001:2000 certified. The Counter Top Reverse Osmosis Drinking Water Purifier removes suspended particles, bacteria, virus, harmful minerals, colour and odour from water. It involves 4 stage purification process: sediment filter, pre-carbon filter, RO membrane and post carbon cartridge. Counter Top Reverse Osmosis Drinking Water Purifier reduces TDS content by 90% and gives natural tasting water. This sleek and aesthetically designed model is available in 2 colours and is also available in high capacities of 15 and 25 litres/hour.