What Is A TDS Meter? How To Use A TDS Meter?

Have you ever felt that the water you are drinking has a bland or salty, or bitter taste? Do you know why sometimes the water tastes so unpalatable? Let me answer this for you. It is due to the concentration of Total Dissolved Solids or TDS present in that water. TDS measures the amount of dissolved combined content of all inorganic and organic particles present in a liquid, mostly water, in ionized, molecular, or colloidal sol suspended form.

Nevertheless, we often tend to misunderstand high TDS levels with bad water quality or contaminated water. Whereas the Total Dissolved Solids reading gives an account of the qualitative measure of the number of dissolved ions and not about the nature of the water. The TDS tests do not even provide an insight into specific water quality issues like Elevated Hardness, Salty Taste, or Corrosiveness. Hence, it can be said that the TDS test is just an indicator to measure the general quality of water. Further, this article will give you an overview of TDS, TDS meters, how does a TDS meter work and operate, and why we should check TDS levels in detail.

What Is TDS?

Total Dissolved Solids or TDS, as it is popularly recognized, can be determined as the total concentration of the dissolved solids present in water. In simple words, it can be said that TDS is the sum of the anions and cations present in the water. Since water is a universal solvent, it absorbs and dissolves impurities quickly. Total Dissolved Solids comprise inorganic salts (calcium, magnesium, chlorides, sulfates, bicarbonates, etc.) as well as a small amount of organic matter. In drinking water, TDS may arise from different places such as natural sources, sewage, urban run-offs, industrial wastewater, chemicals utilized in the water treatment process, chemical fertilizers used in the garden, plumbing, etc. High TDS of water is generally not considered a health hazard. However, it tends to alter the salinity and taste of water, making it bitter, salty, or brackish in taste.

What Is A TDS Meter?

What Is A TDS Meter?

The most efficient way for measuring the TDS of a water sample is by evaporating the liquid and weighing the solid particles that remain after the evaporation. However, this might not always be feasible. Hence, a TDS meter is utilized to determine the total amount of dissolved solids present in water. A TDS meter or a Total Dissolved Solids Meter is a small-sized handy device that indicates TDS in a solution, mainly water. A TDS meter estimates the TDS in a sample by measuring the conductivity of the solution. The idea behind measuring the conductivity comes from the fact that generally, the dissolved solids like salts and minerals present in water increase the conductivity of a solution. Along with normal drinking water, a TDS is also utilized for measuring the amount of total dissolved solids in pools, aquariums, spas, hydroponics, etc. If you feel you need to use a TDS Meter, you can look at our article, “Best TDS Meter In India” to choose an accurate and trustworthy TDS Meter.

I. How to Use A TDS Meter?

A TDS meter is a very simple and reliable device that we can use to determine the TDS of water. The reading of TDS meters comes in parts per million (ppm). The principle on which a TDS meter works depends on the measurement of the electrical charge of the dissolved solids. The device emits a small electrical current that passes through the water to be tested. Then this electrical conductivity is captured by the meter and converted into a TDS number. Few meters can provide both the actual EC (electrical conductivity) reading and the TDS value. You can operate a TDS meter by following the given steps:

Step 1. Remove the cover from the bottom of the tester

Step 2. Turn on the unit by pressing the On/Off button. The display should read 000.

Step 3. Insert the tip of the tester into the water sample to be tested

Note: Do not submerge the tip more than half an inch to prevent damaging the TDS meter.

Step 4. Read the numbers on display expressed in PPM. This number shall determine the TDS value of the sample.

Step 5. You can press the Hold button for locking the number on the display so it won’t go away.

Besides using a TDS meter, you can also use a filter paper and scale to check the tds level of water. If you think you will find that method better, you can learn how to check the TDS Level of water using filter paper and scale in this article.

II. An Overview Of TDS Levels

Overview Of TDS Levels

WHO has stated that the acceptable range for TDS level in a water sample is around 300 ppm. TDS level of water within 300 ppm is suitable for human consumption. Although a TDS level higher than 300 ppm is certainly not hazardous to health. Yet, the water may not be palatable enough for us to drink it due to the presence of a high concentration of minerals like sodium, potassium, and other salts in it. However, TDS levels beyond 1000 ppm are considered unfit for drinking purposes. In fact, TDS levels that are more than 1200 ppm are declared unacceptable by WHO. This extreme spike in TDS levels might alter the water’s color, odor, and taste. Moreover, water with high TDS concentrations causes excessive scaling in water pipes, heaters, boilers, and household appliances.

Why Measure TDS?

Normally, mineral water has neither any nor any taste. An alteration in the TDS level changes the taste and texture of water, making the water unpalatable and unpleasant for utilization. Few reasons why you should consider measuring the TDS level of your drinking water are stated below:

1. Taste: High TDS concentrations can make the water salty and/or bitter.

2. Health Concerns: High TDS levels won’t radically affect your health, yet the high concentration of inorganic/organic matter can make you sick.

3. Cooking: TDS levels beyond 1000 PPM can affect the taste of food.

4. pH: TDS concentrations correlate with pH levels in terms that a higher TDS value indicates higher conductivity, which reduces the pH, making the water acidic.

What Does A TDS Meter Reading Imply?

What Does A TDS Meter Reading Imply

There is no certainty that the TDS level will indicate whether or not the water contains contaminants. A higher TDS meter reading doesn’t necessarily mean the water is unsafe. Nevertheless, it could indicate that further testing is required. High TDS meter readings are usually the result of the presence of high mineral content, making the water hard. Hard water can be turned into soft water by using a few methods that are mentioned in our article of “How To Make Hard Water Soft“. Low TDS meter readings might be an indicator of corrosion. These lower levels can affect the pH of the water, making it more acidic and corrosive. The TDS levels vary based on the area or country in which you live.

A high TDS level simply indicates that there could be particles that might affect the taste and smell of the water. A water filter may help in correcting the high TDS levels. It should be kept in mind that high TDS concentrations don’t mean that the water is unsafe or unfit to drink. However, although a Total Dissolved Solids meter is a simple way to check and monitor the TDS levels regularly, it is not a method to rely upon for judging the water quality after all.


Elevated TDS levels do not indicate that the water is a health hazard. But it might direct that the water has aesthetic issues or create nuisance problems related to taste, staining, or precipitation. Higher TDS levels may suggest that total dissolved solids may indicate the presence of heavy metals that prove to be toxic to humans. A TDS meter may come in handy to keep a check on the TDS levels regularly. This is considered the most ideal and practical approach to find out about water TDS levels.

Akanksha is a fond food critic and a wellness enthusiast, aiming to always look on the brighter side of life. Aligning with her interests, she has pursued a masters in hospitality and hotel management. She believes that the effects of ageing can be significantly controlled if we monitor the quality of our food accurately. Through this blog, it’s her aim to share what she’s learned through the years across these domains. Follow her on Facebook