The wastewater displacement of Xiaomi water purifier is 1:3.
The official service life of RO membrane is 18-24 months. So it can be used for a year no matter what.
Only the remaining three-stage filter elements need to be replaced within a year.
There are references given by enthusiasts, you can take a look.
(59x4=236)+(69x2=138)+(499/18x12=333)+(69x2=138)=845 yuan, the annual maintenance cost is 845 yuan.
How to choose a cost-effective water purifier? You can refer to the following important indicators when purchasing:
1. Look at the filter element: the core component of the water purifier. Its quality directly affects the purification indicators of the water purifier.
First of all - pay attention to whether the filter element can filter impurities and make the water look clearer (it can be said that any water purifier can do this, but different filtration methods have completely different effects)
Filter membrane: The market is also full of filter membranes with various names, such as pp cotton, etc.; in fact, their only function is to filter impurities above a certain size.
Reverse osmosis: the most common on the market, with a filtration rate of 99% becoming its biggest selling point; the disadvantage is also obvious that it is too clean (without any minerals that are beneficial to the human body; and it cannot filter bacteria, viruses, etc. Microorganisms) filter slowly.
Secondly - pay attention to whether the filter element can filter odor and improve the taste (any water purifier equipped with activated carbon can do this, but the effect, lifespan and price of the filter element structure vary greatly)
Granular activated carbon filter element: It can remove odors in a short time, but over time it will be flushed out of the waterway and lose its filtration effect; Disadvantages: The service life is uncertain (the user will not know until the filter element loses its purification ability) )
High-density activated carbon: long service life; block structure, does not form water channels; disadvantages: complex production, expensive (100 times higher than equal-weight granular activated carbon) due to patent protection (High production costs)
Finally - pay attention to whether the water purifier can kill microorganisms. Viruses and bacteria in microorganisms are potential pathogens that must be eliminated (general products cannot kill microorganisms; certain Some products can kill microorganisms, but the technology determines the risk of purification)
Chemical sterilization: Use chemical filters to kill microorganisms; Disadvantages: Chemical residues, affecting taste and health (processing method: install after the chemical filter element, Improved taste ion filter or activated carbon filter; making it impossible for consumers to detect abnormalities directly from the taste and making it more difficult to identify chemical residues)
Ultraviolet sterilization; sterilization rate as high as 99%; Disadvantages: Requires electricity (potential potential leakage safety risks; of course potential risks can be avoided through wireless power conduction technology) but this technology is protected by patents (production costs are high)
A qualified water purifier can: filter impurities and retain them, which are beneficial to the human body It is enough to improve the taste of drinking water by adding minerals
A high-quality water purifier must: filter impurities, retain minerals that are beneficial to the human body, filter various chemical pollutants, and improve the taste of drinking water at the same time. Kill bacteria and viruses
2. Check the installation: Whether the installation of the water purifier is convenient will directly affect your future use (Is it easy to move? Can you install it yourself? The simpler the installation, the easier it is to maintain)< /p>
Avoid - Changing the pipeline is mostly for under-counter machines, which will be very inconvenient when the filter element needs to be replaced.
(For example: Reverse osmosis needs to install a booster valve and the pipeline must be modified, so it requires professionals to come and install it, which is very troublesome and also poses potential safety hazards for people to enter and exit)
(For example: Low-end machines also need to modify the pipes to install additional purified water pipes, which also require professional on-site installation)
Best - no need to modify the pipes, wall-mounted or tabletop water purification equipment, installation and replacement are very convenient .
(For example: eSpring water purifier uses a diverter valve. You only need to connect the diverter valve to the faucet to separate the use of purified water and tap water. It is easy to install)
3. Look at the consumption: waste water - Water purifiers with reverse osmosis technology produce waste water during the water purification process. Heavy metal elements in the waste water often exceed the standard several times and dozens of times. Therefore, washing clothes with the discharged waste water will harden the clothes. ; Used for mopping the floor, it will damage the floor and floor tiles; it cannot even be used for flushing the toilet, which will corrode ceramics; it is not even possible to be used for washing vegetables; therefore, the generation of waste water greatly increases the cost of use.
The proportion of wastewater directly affects the consumption of the water purifier. The ratio of wastewater produced by low-end water purifiers is as high as 1:6 (purifying 1 ton of drinking water requires 6 tons of water; 1 ton Tap water costs 3 yuan, so drinking 1 ton of direct drinking water costs 18 yuan)
Some companies with mature technology can reduce wastewater consumption to 1:3 (that is, drinking 1 ton of direct drinking water costs 9 yuan) )
Water purifiers that do not use extreme technology such as reverse osmosis will not produce wastewater during the water purification process, greatly saving purification costs.
Filter element - During the purification process, water purification equipment will filter impurities and other harmful substances to contaminate the filter element, so it needs to be replaced regularly.
The common water purifiers with several levels of filtration technology on the market: generally replace the impurity filter element, pp cotton and activated carbon filter element every 3 months; replace the reverse osmosis filter element every 6 months; the price ranges from 150 to 800 yuan. If you replace the filter element on time in a year, not counting the labor costs of door-to-door service personnel, it will cost about 100 yuan * 3 filter elements * 4 times + 800 yuan * 2 times = 2,800 yuan; in fact, the cost of filter elements is much more than this cost, but many people are worried about replacing them on time. That’s all)
High-end water purifiers all use filter cartridges (filter elements are integrated into sets) and only need to be replaced once a year at a cost of about 1,500.