Re-Use Waste from Reverse Osmosis (RO) Filter

Many of us use Reverse Osmosis Filters (RO filters) to purify Drinking Water, in areas with high TDS (Total Dissolved Salts) content in the Water.

Around 75% of the Water fed into a RO filter, is wasted. Only 25% gets extracted as drinking Water.

This causes a tremendous Overhead on the Water Supply as well as Sewage Treatment system of Apartment Complexes.

So, what can you do about it?

Kannan Venkitachalam, a Resident of Shakthi Hilands in Bangalore and a Water Warrior, shares how he re-uses the Waste Water from his Reverse Osmosis Filter, seamlessly.

” Please find my home RO system waste water reusing method for washing clothes. I am following this for the last 6 to 7 years.

For 1 liter safe filtered drinking water in the RO tank 3 liters goes rejected as hard water. But it is good to reuse for washing clothes, kitchen utensils cleaning, floor moping, car washing etc.

Important, the container which you use to collect the rejected water need to have bigger opening, so that monthly once you need to clean with scotch brite for cleaning the scale. Need to have sufficient opening to put your hand inside. The container which I have is just Rs.150/- from China Bazaar”

Here are the Photos. Kannan can be contacted at




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About the Author: Vishnu