Reverse osmosis (RO) is a filtration method that removes many types of large molecules and ions from solutions by applying pressure to the solution when it is on one side of a selective membrane. The result is that the solute is retained on the pressurized side of the membrane and the pure solvent is allowed to pass to the other side. To be "selective," this membrane should not allow large molecules or ions through the pores (holes), but should allow smaller components of the solution (such as the solvent) to pass freely.

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City strong market for reverse osmosis plants

TNN,Mar 3, 2011, 05.19am IST

CHENNAI: The city, which appears to be seeing an increase in water safety awareness, is fast becoming a potent market for table top reverse osmosis plants, say water technology experts.

A table top reverse osmosis plant which looks like a water purifier involves a five-step purification process, including carbon blocking. The cost of the product had also dropped down drastically from Rs 25,000 eight years ago to Rs 6,000 at present.

"Water which was once scarce in Chennai is available in abundance now. The concern is now about the quality, hence new technology is coming into the country, especially the southern part," said S Suthakar, managing director of Aqua Designs India limited.

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