Top 6 Innovative Ways You Can Use the Waste Water from RO Water Purifiers

Using RO water purifiers not only gives us safe, clean and tasty water but also protects us from life threatening water borne diseases.

But there is one big drawback of using RO water purifiers i.e. the excessive wastage of water. An average RO purifier wastes approximately 3 litres of water for every 1 litre of purified water. That means only 25% of water is purified and 75% of water comes out as waste.

Wondering why so much water is wasted? Reverse Osmosis (RO) purifiers use membrane technology to filter dissolved impurities, the impure water is filtered out and is often called waste water or reject water. The percentage of waste water varies according to the RO purifier being used.

Because of the high level of impurities and dissolved solids this reject water is not fit for drinking or bathing.
However, the RO waste water can be used in various ways to avoid overall wastage of water in your home or office.
Before we check out how we can use this waste water, it is important to keep some basic things in mind to avoid any issues or problems.

Things to Keep in Mind Before Using the RO Waste Water

It is best to determine the TDS level in the reject water before deciding to reuse for other purposes. Because if the TDS level is too high in the RO waste water then it might not be suitable for reuse in most of the applications given below. See how you can check the TDS level of water.

To be 100% sure, if possible, the waste water should also be tested for presence of inorganic and chemical impurities like Sodium.

The bucket, container or tank used for storing RO waste water should have a wide opening so you can easily clean the deposits at regular intervals.

  1. Wash Your Car

    A single car wash could consume anywhere between 14 litres (for car wash using a bucket) to 75 litres (for car wash using a hose pipe) of water. Keeping in mind the scarcity of drinking water, using so much potable water for car wash seems unreasonable and no lesser than a crime.Car WashWe believe, washing cars everyday not only wastes a lot of water but is unnecessary. If you are using a RO water purifier at your home or office then you can simply store the waste water in some tank or bucket and reuse it for washing your car.Water with a TDS level of 1200 – 1500 PPM can be safely used for car washing.If the TDS level of waste water is high you can mix tap water to dilute it. This should lower down the TDS level.

  2. Watering Your Plants or Home Garden

    If you are someone who loves gardening or have planted some plants in pots, the waste water can be used for watering your plants to keep your indoor or terrace garden green. This tip is particularly useful for people living in urban areas as the TDS level in municipal water tends to be lower.GardenTo be on safer side, you can start with few plants. Use the RO waste water for 15-20 days and check its effect on the growth of your plants. Each plant will respond to this change differently, which will give you a clear understanding of which plants are responding better to RO waste water.For gardening/irrigation use, a TDS level of up to 2100 PPM is permissible. You should also check out the percentage of Sodium, it should be less than 60 % ( 1.e. Na / Na + Ca + Mg). High Sodium content causes loss of soil porosity and therefore harmful for soil fertility in the long run.

  3. Wash Your Utensils

    Another useful application for RO waste water is to wash your utensils. Simply store the waste water in bucket or tank, make sure you place the bucket for collecting RO waste water near your kitchen sink so it can be used easily when you clean your utensils.

  4. Floor Mopping

    Using the RO waste water for mopping the floor is easy and will definitely save tens of litres of clean water every day. If you have a bigger house then the savings could be in hundreds of litres every single day.If the TDS level of waste water is high (over 2000 ppm):

    • Dilute waste RO water with equal quantity of tap water. Because plain RO waste water with high TDS may stain or leave salt particles on floor.
    • Use the RO waste water for floor mopping on alternate days. This will reduce the chances of any stains or salt deposits.
  5. Pre-rinsing Laundry

    You can use the RO waste water for daily laundry as well, but please keep in mind that using high TDS water might not be suitable for some delicate fabrics.Most of the Indian homes now use washing machines, though washing machines save a lot of time and effort but also result in a lot of wastage of water.You can create an overhead tank which collects the RO waste water and use the waste water from this tank directly in your washing machine (do keep in mind the fact about delicate fabrics)?This tip works best for semi-automatic & twin tub washing machines.RO Waste Water Used for Washing Clothes
    Image Source: Facebook

  6. Cleaning and Flushing Your Toilets

    Another big source of clean water wastage in modern homes is use of toilet flush. Every single flush sends approximately 5 to 7 litres of potable water down the drain.RO waste water can be used effectively to reduce this wastage of clean water by using it to flush your toilets.When you start, always monitor your toilet seats for any discoloration on porcelain surfaces after few days. With a periodical cleanup using common toilet cleaners the chances of discoloration and salt deposits can be avoided.


Looking for a RO purifier which produces very little or no waste water? Check out KENT RO Water Purifiers. These purifiers use Save Water Technology which recovers 50% pure water and stores the rejected water in a separate tank.


Every year we read and listen to news of farmers committing suicide because of droughts. And there are thousands and lakhs of families in our country who have to travel for miles every day to collect drinking water. If you are fortunate enough to be blessed with sufficient water supply, think of it as a privilege.

Do your bit by saving every drop of water. These small measures can really make a lot of difference because EVERY DROP COUNTS.

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