1, pure water machine, municipal water supply water source water after particulate filtration, activated carbon adsorption and so on primary treatment, and then on the pre-filtered water pressure to make it through the aperture size of one ten thousandth of a micron RO (reverse osmosis, Reverse Osmosis) membrane, so that the water molecules and the ionic state of the mineral elements through the reverse osmosis membrane, and the majority of the inorganic salts dissolved in water (including heavy metals), organic matter, as well as bacteria, viruses, etc. can not pass through the reverse osmosis membrane, so that the infiltration of pure water and the concentration of water can not be infiltrated through the strict separation.
Comments: Filtering out all the substances above one ten-thousandth of a micron in tap water, the purity is very high. However, the pure water machine to filter out minerals at the same time, but can not remove some of the smaller volume of acidic substances in the water, the water is basically acidic water below PH6, below the national standard, there is a view that long-term consumption of acidic water, mineral trace element content is too low in water is not conducive to human health, although some manufacturers claim to have added a mineral slow-release materials, but the actual effect has not been achieved. In addition, water production at the same time produce about 50% of the waste water without any use value.
2, ultra-filtration water purifier, municipal water supply water source water after particulate filtration, activated carbon adsorption and so on primary treatment, into the ultra-filtration membrane tube, under the action of the water pressure difference, the membrane surface of the densely packed with a lot of 0.01 micron micropore only allows water molecules, beneficial minerals and trace elements through the water to become purified water. And bacteria, rust, colloids, sediment, suspended solids, macromolecules, organic matter and other harmful substances are retained in the ultrafiltration membrane tube, in the ultrafiltration membrane for flushing when discharged.
Comments: The degree of water purification is slightly lower than the pure water machine, poor water quality, high hardness of the region is not recommended, acid pollution, heavy metal contamination in serious areas can not be used. Some manufacturers put a variety of filter material mixed use, softening cartridge, mineralization cartridge, replacement of heavy metal cartridge, sterilization cartridge, contradictory theories can often say a lot.
3, water softener, soft water and vice versa is hard water, is the use of resin polymerization materials cartridge to exchange metal ions in the water. A relatively simple combination of filters.
Comments: The exchanged are often calcium and magnesium ions, different exchange materials release different substances into the water, can not be constant. Simple filtration, water quality is relatively good in the region does not need, water quality is relatively poor in the region does not work, is not recommended as drinking water equipment.
4, electrolysis water maker, through the pre-filter on the municipal water supply filtration, the clean water into the electrolysis tank to separate the membrane as a medium in the water to apply DC voltage, the use of electrolytic plates to make the water decomposition, while separating out the weakly alkaline water and weakly acidic water. Due to the calcium, magnesium, sodium, potassium and other minerals in the water gathered in the cathode, hydroxide ions (OH-) increase and become weakly alkaline water; oxygen, sulfuric acid, sulfur yellow, etc. is led to the anode, increase hydrogen ions (H +) and generate weakly acidic water.
Comment: health care companies launched products, prices are inflated, after-sales service problems are serious. With the same pure water machine, experts disagree more, but most agree that weak alkaline water, some manufacturers even applied for a "medical device registration certificate. Drinking alkaline electrolytic water with pH value higher than 8.5 requires close attention to health conditions. Primary filtration is not sophisticated enough, and areas with hard water and heavy metal contamination need to add or change the filter material. If the configuration (filtration) in place, high quality, affordable (below 3500), after-sales protection (brand) electrolytic water maker, belong to the better choice of home water purifier.