Residual chlorine is one of the most special detection indicators in tap water because it is the only substance that is specifically added to tap water, and is a substance that must be added but cannot be added excessively. Its main function is to suppress the amount of bacteria in the process of water transport and it will be consumed as time goes by.

However, in actual situations, the residual chlorine in the tap water disappears or becomes too high due to various situations, causing water troubles. Because the pipe network is too long or seriously polluted, the residual chlorine in the tap water will disappear too quickly and will not achieve antibacterial effect. At this time, artificial supplementation is needed, and the necessary testing tools are often absent during the supplementation process. With the addition of personnel experience, it will cause excess chlorine, and the most immediate problem is the large chlorine content of water, and it may also be due to the chemical reaction of some organic substances with residual chlorine in the water to produce toxic and hazardous chemicals. At the same time, in industrial water treatment, excessive residual chlorine will accelerate the damage of the water treatment equipment and increase the production cost.

Whether it is in family life or industrial applications, the detection of residual chlorine is necessary whenever it comes to tap water. Since residual chlorine is the basic tap water index, its detection method is also relatively complete. In GB5750-2006, a complete detection method is provided. At the same time, since residual chlorine detection is a basic self-water quality index, it is of great significance. A variety of detection tools are also provided, including instruments, reagent kits, test strips, etc. Users can select different products according to actual needs and measurement ranges.

Remarks: free chlorine and total chlorine free chlorine: also known as free chlorine in the Cl2, HOCl, OCl-system and other free residual chlorine, is a good effect of anti-virus in water, a strong oxidizing chlorine component,

Combined chlorine: When there is ammonium (amine, ammonia) in water, chlorine reacts with ammonium to produce chloramine (monochloramine, dichloramine, trichloramine). The bactericidal effect of chloramine is far weaker than hypochlorous acid and it has an odor. Total Residual Chlorine: Free Residual Chloride and Combined Residual Chlorine The general term for what we call “Free Chlorine” refers to Free Chlorine, and “Total Chlorine” refers to Total Residual Chlorine Residual Chlorine Detector: generally using electrochemical or spectrophotometric methods. The rapid detection of residual chlorine has a high accuracy, which is almost the same as the traditional laboratory analysis method, but it is more simple and easy to use.

Remaining chlorine test box: A type of product extended from the standard method, using the colorimetric method, through the reaction of the residual chlorine in the water and the special chemical reagents to develop the color reaction, so as to judge the residual chlorine in the water, this kind of product can detect the lower limit Generally can reach 0.05mg / L, can meet the needs of the general household and industrial users residual chlorine test strip: Compared with the residual chlorine test box, its detection range will be greater, but the accuracy will be worse than the residual chlorine test box . Usage is similar to pH test paper.

If the user's requirements are higher, the residual chlorine detector can be selected. As a consumer user or a general industrial field user, a low-cost residual chlorine detection cartridge can also be selected. Due to the lack of uniform quality standards for such products in the market, products of professional manufacturers should be selected as far as possible when selecting products. Companies such as HACH, Merck, MN, and Lovibond from the United States are among the best in the industry. In recent years, some domestic manufacturers have become more reliable. The product, like the EasyBox test box of Guangdong Huankai.