Reverse osmosis (RO) is only ...
Published by Rahul Kumar, Product Development Manager at Whirlpool Corporation
Reverse osmosis (RO) is only process to reduce TDS more than 500. A RO could reduce TDS level upto 90-95%. So a ro could reduce your input water TDS from 2000 ppm to 150-200 ppm which is safe to use for drinking purpose (WHO recommend any TDS less than 500 ppm is good)