Ion Exchange [India] Ltd offers Cartridge for Removal of Physical Impurities. Ion Exchange [India] Ltd. Is ISO 9001:2000 certified. The Cartridge for Removal of Physical Impurities converts ordinary candle filter into a purifier. It includes 3 stage purification process system and helps in removal of colour and odour from water. This Cartridge for Removal of Physical Impurities has 3000 litres of purifying capacity.