Life is inseparable from clean water. The earliest ancestors of mankind evolved from water. Today, the water content in human bodies is still as high as 70% or more. However, at the current stage when the environment, especially water pollution, is increasingly severe, how can we know that we drink every day? Is the water in the stomach clean?and how to measure water quality at home？
Don't worry, one of the important tasks of this article is to share a "simple, cost-effective, and easy-to-use method for testing your own water quality"!
how to measure water tds at home
When it comes to water quality, many people must be familiar with the "TDS test pen".
In fact, the "TDS testing pen" has become one of the most commonly used drinking water quality testing tools.The TDS meter working principle is very simple.
TDS is the abbreviation of total dissolved solids, translated into Chinese is: "Soluble Total Solids", the unit of measurement is milligrams per liter (mg/L), which indicates how many milligrams of dissolved solids are contained in 1 liter of water, including soluble salts (Calcium ion, magnesium ion, etc.), ionic organic matter (ammonium acetate, sodium sulfate, etc.), some heavy metal ions (chromium, zinc, lead, copper, etc.).
The TDS value reflects the content of soluble substances in the water, the lower the value, the less the content of soluble substances in the water.
Can you judge the quality of drinking water just by looking at the TDS value?
The answer is definitely no! The quality of water depends on many factors, and TDS is just one of many water quality indicators. Qualified drinking water quality also needs to be tested including microbiological indicators (total colonies, heat-resistant coliforms), toxicological indicators (heavy metal ion concentration), sensory characteristics (color, smell, taste, visible to the naked eye) and other indicators.
The completion of this series of testing equipment is not something that a TDS test pen can complete. Gas chromatographs, high performance liquid chromatographs, infrared oil testers, ion chromatographs and other professional equipment that ordinary people can’t even understand their names are in hand. It is possible to complete a complete water quality test.
After all, using a TDS pen to test water quality is actually useless?
The words are not so absolute! The TDS detection pen detects "Total Dissolved Solids", which is usually used to detect pure water that has been filtered by RO reverse osmosis membranes. It is one of the important indicators for measuring the quality of pure water. The significant drop in the value before and after purification means that the water quality has improved.
The standard for direct drinking water published by the World Health Organization is that the TDS value is less than 50; the EU is less than 70; the United States is less than 50. Therefore, friends who have a water purifier, always have a TDS test pen at home, which can better test the purification effect of the water filter.
Although TDS pen detection is not the only way to judge the quality of water, it uses a relatively low cost to give ordinary people like you and me a quantifiable data to visually show whether the drinking water is within a reasonable range. After all, the cost of those highly compelling black technology equipment is so high that it is unimaginable!
how to measure tds in water at home without meter
So curious babies must continue to ask, besides the TDS test pen, is there any other simple water quality test method that can be done by yourself? Ou Ge really prepared two small tricks here, and interested friends can try them.
1. Test the residual chlorine in the waterThe water plant uses chlorine to perform primary disinfection of tap water to make it reach the national drinking water safety index. However, the treatment of chlorine causes residual chlorine to be produced in the water, and a certain concentration can also harm health.
To test the residual chlorine content, we need to prepare a residual chlorine test agent, and then prepare two cups of 15ML water, one cup is the water purified by the RO membrane, and one cup is ordinary tap water. Add 2 drops of the residual chlorine test agent to the two cups of water. The color of the water will change. There is a residual chlorine color comparison card in the manual of the residual chlorine test agent. We can find the corresponding position on the color card according to the color of the water, and then we can roughly know the residual chlorine content. We can also compare two cups of water, the darker color has a higher residual chlorine content.
2. Test the content of calcium and magnesium ions in the waterTake 2 clean and transparent cups, one cup for tap water, and the other cup for water purified by the reverse osmosis membrane. Drop the same dose of calcium and magnesium reagent into two cups of water. If the water turns milky white, it will contain a large amount of calcium and magnesium ions, which is commonly referred to as scale.
Regular drinking of tap water containing a lot of limescale can also be harmful to health, such as yellowing of teeth, tartar, and gallstones.
In short, water issues are related to people's livelihood, and water quality testing occupies an important position. Safe drinking water is the goal that everyone yearns for and pursues. Only by learning to recognize water can we better protect the health of family members and themselves.