How to Use Waste Water from Water Purifier?

According to the latest National Sample Survey (NSS) report, more than one-fifth of urban households use electric water purifiers, and the usage of RO systems is also included in that statistic.

So, it is evident that water purifiers are one of the most important home appliances you should have. The urban areas are more or less full of pollution. The usage of plastic is more in urban areas. Besides, there is also the contamination of industrial waste and pesticides that seep through the ground and pollute groundwater. The contamination also pollutes the lake and river water.

At this point, there is no other option than to have a top-quality RO water purifier. Only the Reverse Osmosis method is the right procedure that eliminates mud and dirt from the water and removes any kind of heavy metals like iron, lead, etc. and chemicals, like arsenic, sulfur, etc. To bring safe and tasty drinking water, installing an RO water purifier is the best option.

But, sometimes, many users get confused about using the RO system as it uses lots of water to produce safe drinking water. To many of us, it is a 'wastage' of water. While water wastage is such a poor practice, installing an RO purifier leads to that as per many users.

Is it the right picture?

If so, then how to use wastewater from water purifiers?

We will discuss it all here.

Why RO Water Purifiers Waste Water?

Now, it is true that the Reverse Osmosis system uses more water than it produces. The best RO water purifiers in India can reduce the wastewater, but they cannot stop producing it. However, it uses liters of water to produce 1-liter safe drinking water, and the rest of the water gets wasted only if you don't start thinking differently.

It is part of the purification process. The purified water is stored in the storage tank while the waste stream of water gets drained out with all the contamination and inorganic. This is known as the wastewater of RO. 


RO water purifier water tank

How Much Is Water Wasted in RO Water Purifier?

The amount of wastage water from the RO water purifier depends on the age of the appliance. If your water purifier is brand new, it consumes 3 liters of water to produce 1 liter of drinking water.

The more it gets older, the usage of water becomes for. For example, a 3-year old membrane uses 10 to 25 liters of water for producing the same amount of drinking water.

Therefore, it is recommended to replace the membrane every two to three years. Once you replace it, it will consume lesser water for purifying, and minimum water will drain.


Can We use the Waste Water from water purifier?

There are two words which are used for water usage, like 'Reuse' and 'Recycle.' With wastewater from a water purifier, you can apply these two tricks. You can always use water purifiers waste water for different purposes.

But, you have to be very careful about using it. You should never use the water for drinking, cooking, or bathing purpose. Also, avoid using this wastewater from the water purifier for any personal use. As this wastewater is full of contaminants and pollutants, it can cause a severe impact on your health.

Rather, go for washing your clothes, car, gardening your plants, using in the toilet, etc. Thus, there will be no water wastage, and you won't get sick from that water.


use wastewater of ro water purifier

How to Reuse RO Water Purifier's Waste Water?

In many parts of India, people suffer from the lack of water wasting a drop of water is not a good practice. But, you can't avoid installing an RO water purifier as that gives you the cleanest and safest drinking water, suitable for kids and aged people too.

There are certain important things you need to remember while using RO wastewater for several purposes. First, make sure you test the rejected water and know the TDS level before using it. If the TDS level is too high, it is not recommended to use it directly. Instead, always mix it with normal tap water before using it.

So, how to use wastewater from water purifiers?

Here, we are here to find the answer to this question. Here are some applications of the waste water from water purifier-

Wash Your Car

To wash a single car, it may take 14 liters to 75 liters of water! That is huge. When a country suffers from water shortage in many states, wasting so much potable water is no less than a crime.

Why not using RO wastewater? 

You can store the wastewater from your RO water purifier in a bucket and use it on the day of car washing. If the TDS level of the water is between 1200 to 1500 PPM, you can wash your car with that water without any worry. If the TDS level is high, then dilute it with tap water and use it.

Water Your Garden plants

Do you love gardening?

Then, you can use the wastewater to water your plants in your garden. But, here, you need to check out certain things. If the TDS level of the water is below 2100 PPM, you can use it for gardening purposes; else, dilute it with normal tap water.

Also, you need to check the sodium level of the wastewater. More than 60% sodium concentration can damage soil fertility and soil porosity further.

First, start with fewer plants and check out how those plants react to the wastewater from water purifiers. Then, if you notice good growth, you can continue watering plants with that water.

Wash Your Utensils in Kitchen

This is another useful application of the wastewater that you can go for. You can store the wastewater in a bucket and use it for cleaning the utensils. You can wash all types of utensils, whether glass, steel, ceramic, or wastewater, from the RO water purifier.

Clean the Floors with the wastewater

Using the RO wastewater for cleaning the floors of your office and house is a very creative idea to recycle the wastewater. Washing the floors with this water will save tons of water every day. If it is a big house, then it will save a lot of water every day.

While washing your house with RO wastewater, you need to check the TDS level of the water. If it is within 2000ppm, then you can use it directly. Else, you can dilute it with the normal tap water. However, using high TDS water may leave stains and salt particles on the floor.

You can also use the wastewater on alternative days to clean the floors. Thus, there will be a lesser effect of salt deposits and stains on the floor.

Use RO Waste Water for Toilet Flushing

This is another effective use of RO wastewater. However, every single flush in the toilet requires 5 to 7 liters of potable water. Rather, if you use RO wastewater to clean your toilet, that will be the best option to save water and reuse it without draining it.

Make sure you use RO wastewater on alternative days to keep the porcelain tank safe from salt deposition and discoloration. You can also clean the faucets, showers, etc., with this water.

Use It for Pre-rinsing Laundry

Washing clothes in a washing machine involves enough amount of water that it completely goes to waste. Using RO wastewater can save the use of potable water. Go for using the wastewater for pre-rinsing the clothes. You should always dilute the water with normal tap water so that the TDS level of the wastewater never affects the delicate fabric.

To remove stubborn stains from your clothes, you can add salt while washing your clothes. RO wastewater can be used the best for cleaning curtains, upholsteries, curtains, etc.

Clean the Sewage Pipes

The sewage pipes of your house, especially the ones with bathroom and kitchen, should be cleaned regularly. Else, those can be clogged and cause damage to your house. Also, that can be the reason for using excess water.

Use RO wastewater is a great idea to clean the sewage pipes of the bathroom and kitchen. This water contains high soluble salt, removing the stubborn grime and dirt from the pipelines and keeping those smooth.


What Are some non-conventional Use of Waste Water from RO Water Purifier?

Apart from these above usages, there are certainly other methods of reusing the wastewater from water purifier without wasting it-

  • Clean the Things Made of Plastic. If you have furniture or anything made of plastic, you can use RO wastewater to clean those.
  • Wastewater from a water purifier can also be used for cleaning materials made of iron, but you need to mix it up with normal water.
  • You can use RO wastewater for bathing your pet. But, as the water contains high soluble salt and other particles, it should be diluted with tap water. Also, it would help if you dried your pet immediately after bathing.
  • Wastewater from the water purifier can also be used for irrigation only after mixing it with normal water. The TDS level can affect the vegetables and flowers are used directly.

Hopefully, here you get all the answers on how to use wastewater from a water purifier. It is a well-known fact that the world is suffering from a lack of water. So, we must reduce the amount of wastewater and reuse it.

RO water purifiers waste a prominent amount of water. But, if you follow the tips to reuse the wastewater from the water purifier, you can save much water. You should also not forget the regular servicing of your water purifier. The more it gets older, it will produce more wastewater. So, it is always recommended to service the appliance regularly.


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Soumya is the editor-in-chief of Homeplace. Being an engineer with more than 8 years of working experience in consumer goods industries with exposure to product development, manufacturing, maintenance and quality control, he is an expert in this field.

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