First, let's briefly understand the ultrapure water machine. Whether it is imported or domestic equipment, the principle is the same. Tap water is pre-treated through a precision filter core and an activated carbon filter core to filter out particles such as sand and adsorb odors, making the tap water cleaner. Then, it is purified and desalinated through a reverse osmosis device. The purified water is stored in a water storage tank. The water quality can reach the national Grade III water standard, and at the same time, the wastewater produced by the reverse osmosis device (also known as "concentrated water") is discharged. Reverse osmosis pure water undergoes deep desalination treatment through a purification column to obtain first-grade water or ultrapure water. If users have special requirements, ultraviolet or microfiltration, ultrafiltration and other devices can be added after the ultrapure water to remove residual particles, pyrogens and other substances in the water.

　　Precision filter cartridges, activated carbon filter cartridges, reverse osmosis membranes, and purification columns are all materials with relatively long lifespans. Precision filter cartridges and activated carbon filter cartridges actually provide protection for reverse osmosis membranes. If they fail, the load on the reverse osmosis membrane will increase and its lifespan will be shortened. If the machine continues to operate, the quality of the pure water produced will decline, thereby increasing the burden on the purification column. Then the lifespan of the purification column will be shortened. The result is an increase in the usage cost of the ultrapure water machine.

　　Therefore, in the use of ultrapure water machines, the following aspects need to be noted.

　　1.Precision filter element

　　Precision filter elements, also known as filtration filter elements, are divided into wire-wound filter elements andPPMelt-blown filter elements mainly filter out large particles such as sand and silt in raw water. Their filtration accuracy includes5Micron1Micrometers, etc. The new filter element is white. If it has been used for a long time, its surface will accumulate silt and other substances, turning brown. This indicates that the filter element is no longer usable. After rinsing off the surface silt with tap water, it can still be used with difficulty1-2It can be used for a week, but not for a long time. The filter element is placed inside the filter bottle. Some filter bottles are transparent, allowing for a direct observation of the color change of the filter element, while others are opaque and need to be unscrewed to observe the changes in the filter element. According to empirical data statistics, the lifespan of precision filter elements is generally around3-6If the raw water contains more sediment, its lifespan will be shorter; if there are fewer particles such as sediment, its lifespan will be slightly longer.

　　2.Activated carbon filter element

　　The activated carbon filter core mainly removes odors, organic matter and other substances in water through adsorption. There is residual chlorine in tap water, which has a significant oxidizing effect on reverse osmosis membranes, so it is removed by activated carbon. The activated carbon filter core does not show obvious changes on the surface. Based on experience, it usually reaches saturation adsorption within about a year and needs to be replaced.

　　3.Reverse osmosis membrane

　　Reverse osmosis membranes are very important components in ultrapure water machines. Their pore sizes are extremely small, so during use, microscopic substances often accumulate on their surfaces. Generally, all manufacturers' ultrapure water machines have a backwashing function, which is designed to wash away contaminants. The water consumption is10l/It can be rinsed within days3-5Second, exceeding10If you want to rinse, do it several more times. If it lasts for a long time (such as1If it is not used for more than a month, it needs to be taken out and soaked in liquid to prevent the growth of stagnant water. However, this process is rather troublesome. It is recommended that even if no water is used, the machine should be turned on frequently with a small amount of water to allow the water inside to circulate and minimize the prolonged accumulation of stagnant water. The lifespan of reverse osmosis membranes is2-3The year is mainly determined by the customer's water consumption, so when users make a purchase, they must choose the matching specification.

　　4.Purification column

　　The purification column, sometimes also called the ultra-purification column according to the water quality requirements of the customer, is designed to deeply desalinate reverse osmosis pure water to reach the level of first-grade water or ultra-pure water. The principle is ion exchange. The lifespan of the purification column is represented by the online resistivity. When the resistance is lower than a certain specific level, it indicates that the purification column has expired, which is quite intuitive. The lifespan of the ion exchange resin is not only determined by the water consumption of the customer, but especially by the filling amount of the ion exchange resin and the quality of the ion exchange resin itself during the production and design by each manufacturer.

　　5.Water

　　Ultrapure water machines that use tap water as the water source usually have two water outlets, namely grade three water and grade one water. The water that comes out through reverse osmosis is grade three water and is stored in the water tank, while grade one water is taken immediately and not stored. Grade three water did not pass through the purification column, while grade one water did. The cost of grade one water is higher than that of grade three water. Therefore, when customers apply water in daily life, they should take water of different qualities according to their water quality requirements. Grade three water should be used as much as possible instead of grade one water to avoid an increase in usage costs.