Testing standards for filter elements configured in water purifiers

As we all know, the standard water purifier is generally five-level configuration: 5μmPP cotton - granular activated carbon - 1μmPP cotton - RO membrane - rear activated carbon. The first three-stage filtration is for the RO membrane. As the pretreatment of the raw water, it is designed to increase the service life of the RO membrane. So the former filter element of the RO membrane of the pure water machine is better than 1μmPP cotton? There are three reasons: 1. The filtration accuracy of 1μmpp cotton filter element is 1 μm, and bacteria, sediment particles, rust and other harmful substances larger than 1μm can be removed as much as possible. When the first 5μm filter element loses its function, it can still protect the RO membrane and reduce the impact of the RO membrane. probability of contamination. 2. It can effectively prevent the activated carbon powder from entering the RO membrane, and protect the RO membrane to minimize the entry of activated carbon powder and prolong its service life. Because before installing the activated carbon filter element, no matter how clean it is, there will be carbon powder flowing out. Installing a 1μm filter element before the RO membrane can act as a barrier, greatly reducing the possibility of artificial pollution of the RO membrane. 3. If the third stage is block compressed activated carbon or sintered activated carbon CTO, three of the five stages of filtration are activated carbon, and the activated carbon filter element is reused, which not only wastes resources, but also increases costs. Losing its due effect is not worth the gain. The second stage is generally granular activated carbon, which needs to be washed during installation, which often causes a lot of black water, and it is easy to be washed out. If it is changed to compressed activated carbon black water, the problem will be solved, and the burden of the third-level PP cotton will not be increased. The filter element of the filter device of the water purifier has a service life. The fiber filter element can generally be used for 3-6 months, and the activated carbon filter element is generally used for 6-12 months. Their lifespan depends entirely on the local water quality, water pressure and water consumption; In the case of regular replacement of the filter element, the shelf life of the reverse osmosis membrane is one year, and the removal rate can reach more than 90%.

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