Users who have installed a water purifier at home must be familiar with this TDS test pen, and under normal circumstances, the installation master will take out this pen test to show you after installing the water purifier.
TDS test pen
The TDS pen has also become a brand, installing the water quality tester in the mouth of the master, they will tell you: the lower the TDS value is the better the water quality, the higher the TDS value is the worse the water quality.
But in fact, can the values measured by the TDS pen really represent the quality of the water? In fact, this TDS value is very one-sided, and does not fully represent the quality of water, everyone should also retain their own judgment when using the TDS pen test, and do not be misled by the brand's publicity.
TDS test pen readings are trustworthy but not fully trusted
First of all, we have to understand the function and principle of the TDS pen, Baidu Encyclopedia describes its function in detail: TDS is an abbreviation of total dissolved solids in English, Chinese translated as the total amount of dissolved solids, measured in milligrams / liter ( mg / L ), which indicates how many milligrams of solid dissolved solids are dissolved in 1 liter of water. It contains the total amount of inorganic salts and organic matter. By detecting total dissolved solids, you can analyze the total mineralization of water quality.
Therefore, in layman's terms, it can test the amount of dissolved substances in the water, and does not specifically reflect which substances are dissolved in the water. Uncertainty about the specific content of dissolved matter does not define whether the water quality is good or bad.
Some netizens really think that mineral water is poor because of the high TDS value reading
For example, the good water in our thinking consciousness must contain mineral water and pure water, if you take the TDS pen to test these two kinds of water separately, you will get two results, the mineral water TDS value may be about 100, the pure water TDS value may be between 0-10, if only by TDS value to judge pure water is better than mineral water, it is obviously the wrong conclusion.
How should the TDS pen be used to be scientific?
First of all, for ordinary families, the reason for contact with TDS pens is mostly the installation of RO reverse osmosis water purifiers, so the biggest use of TDS pens is to detect the filtration effect of water purifiers. Usually after the RO water purifier filtered out of the tap water, TDS value can be reduced to less than 0-30, at this time can be said that the lower the TDS value, the better the purification effect of this water purifier, and regularly use the TDS pen to test the water quality of the water purifier can also understand the working state of the machine in time.
The measured TDS value of the tap water after the water purifier treatment was significantly reduced
In addition to testing the working state of the water purifier, what else can the TDS pen be used for. Another use of the TDS pen is to detect the softness and hardness of domestic water in a rough range. Under normal circumstances, the TDS value of soft water will be lower than 100, and our normal municipal tap water is generally between 150-300.
In addition, according to the mainland's 2006 "Drinking Water Sanitation Standards" for the TDS value of drinking tap water limit requirements are: less than or equal to 1000mg / L, so if the value is greater than 1000 is not recommended to drink.
For the majority of users, TDS pen still has a certain practical significance, the price is also very cheap, home can be prepared to test the water quality of the situation.