When it comes to clean water, it can be hard to determine whether it is safe for consumption. Some water sources may contain several molecules and particles which it may have collected over time. 

Rainfall, in particular, will pick up salts and various minerals once it flows down the mountain and to rivers, lakes and seas. Some of the minerals it may collect include magnesium, sodium and others. As this happens, it improves the taste of the water and increases its pH levels. If the water has low pH levels, the water has high acidic content and makes it bad for drinking. 

Aside from minerals, rainwater – once it reaches bodies of water – will be exposed to impurities like waste materials, pollutants and others. This is dangerous because wastes, like industrial pollutants, may contain heavy metals like arsenic, mercury and lead. 

The minerals and other particles found in water vary in concentration levels and it presents a danger for many to use or drink. To make sure that the water is safe, getting the best water purifiers is recommended because they can purify water and remove any harmful chemicals or Totally Dissolved Solids (TDS). 

But, how can you tell if there are TDS concentrations in the water supply? And, is there any meaning to them?


How do I Check TDS Levels?

Water purifier technicians use a small thermometer-like device to determine the water quality in the area. The device they are using can determine the TDS levels in any liquid solution. TDS levels make the water conduct an electric charge. The TDS device will check the conductivity of the solution and estimate how much TDS is in it. 


Here’s how to use a TDS Meter:

  1. Use a clean cup to collect a sample
  2. Open your TDS meter and remove the cap on its tip
  3. Put the electrodes installed at the end of the meter but don’t submerge the meter completely underwater
  4. Make sure that there are no bubbles on the electrodes. You can remove these bubbles by stirring the water slightly with the meter. 
  5. Let the meter read the solution for 5 seconds and check the results in the screen of the meter. 
  6. Remove the meter once you get the result and remove the excess water from the electrodes. Put the cap over the meter and keep it in a safe place. 


What Do the Levels Mean?

If the value recorded on the screen is around 300mg/litre (ppm) or 500 mg/litre, it is safe to use. If it is above 500 mg/litre, it will require further purification. 

If the values are around 50 mg/litre and below, the acid content is very high and it is unfit for use or consumption. The same can also be said if the values are around 2000 mg/litre. 

Remember: the TDS meter records only the TDS levels in the water. It does not record the contaminants in the water. It may register if the TDS levels are around 300 ppm. If the record does reach this level, it is still safe to use, but it may contain particles like mercury and arsenic which are dangerous in high quantities. 



Having a TDS meter is important because you cannot be sure if the water you are actually drinking is safe. However, you need to know how to use it to determine the right RO water purifier that will clean your water supply properly. Getting the wrong RO water purifier may put your family at risk to unsafe water, so make it a point to check your TDS levels before buying a purifier!

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