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This must be understood by the laboratory water purifier.
First of all, a simple understanding of the laboratory pure water machine , regardless of imported or domestic equipment, the principle is the same, tap water through the precision filter and activated carbon filter for pretreatment, filter sediment and other particulate matter and adsorption of odor, so that tap water becomes more Clean, and then desalted by the reverse osmosis device, the purified water is stored in the storage tank, the water quality can reach the national three-level water standard, and the wastewater produced by the reverse osmosis device (also called "concentrated water") is discharged. Reverse osmosis pure water is subjected to deep desalting treatment through a purification column to obtain first-grade water or ultra-pure water. Finally, if the user has special requirements, ultraviolet sterilizing or microfiltration, ultrafiltration, etc. are added after the ultrapure water to remove residual water. Bacteria, particles, heat sources, etc.
The precision filter element, active filter element, reverse osmosis membrane and purification column are all materials with relative life. The precision filter element and the activated carbon filter element are actually the protection of the reverse osmosis membrane. If they fail, the load of the reverse osmosis membrane is aggravated and the life is reduced. If the water is turned on, the quality of the pure water produced will decrease, which will increase the burden on the purification column, and the life of the purification column will be shortened. The end result is to increase the cost of using ultra-pure water machines. Therefore, in the use of ultra-pure water machines, there are the following things to note:
1. Precision filter core filter element, also known as PP filter element, mainly filters large particles such as sediment in raw water, and its filtration precision is 1 micron. The new filter element is white. If the surface is long, the surface will be silted, etc., and it will appear brown. This means that the filter element can not be used. After washing the surface sludge with tap water, it can barely continue to use for 1-2 weeks, but it cannot be used for a long time. . The filter element is placed inside the filter bottle. Some filter bottles are transparent. The laboratory pure water machine can visually observe the color change of the filter element. Some filter bottles are opaque and need to be unscrewed to observe the change of the filter element. From the empirical data statistics, the life of the precision filter element is generally from March to June. If there is more sediment in the raw water, the life is shorter, and the sediment and other particles are less, the life is slightly longer;
2. Ultra-pure water machine with water and tap water as water source generally has two water outlets, namely three-stage water and first-grade water. The water that is reverse osmosis is three-stage water, which is stored in the water tank, and the first water It is ready to use, not stored. The tertiary water does not pass through the purification column, and the first stage water passes through the purification column, and the cost of the first stage water is higher than that of the third stage water. Therefore, when customers use it in daily use, they should take water according to the water quality requirements. When using three-stage water, try not to use the first-grade water to avoid the increase of the cost;
3. Reverse osmosis membrane Reverse osmosis membrane is an important part of ultrapure water machine. Its pore size is very small. Therefore, microscopic substances such as bacteria are often deposited on the surface during use. The pure water machine has automatic flushing function. Rinse off the contaminants. The water consumption can be washed 3-5 times within 10 liters/day. If it exceeds 10 liters, it should be washed several times. If it is not used for a long time (such as more than 1 month), it needs to be taken out and immersed in the disinfectant to avoid the breeding of bacteria. However, the process is troublesome. It is recommended that even if it is not used, it is often turned on with a small amount of water to allow the inside of the machine. The water forms a circulation, and the deposition time of the dead water is minimized. The life of the reverse osmosis membrane is 1-2 years, which is mainly determined by the water consumption of the customer.
4, activated carbon filter activated carbon filter mainly through the adsorption, remove odor, organic matter and so on. There is residual chlorine in the tap water, which has a great oxidation effect on the reverse osmosis membrane, so it must be removed by activated carbon. The activated carbon filter has no intuitive change from the surface. According to experience, it generally reaches saturated adsorption in about half a year and needs to be replaced.
5, the laboratory pure water machine purification column is the role of deep desalination of reverse osmosis pure water, and finally reach the level of first-grade water or ultra-pure water. The lifetime of the purification column is represented by the resistivity online. Below a certain resistance means that the purification column has expired and is relatively intuitive.