1, water purifier, high-quality source water for municipal water supply is subjected to primary treatment such as particulate matter filtration and activated carbon adsorption, and then the pre-filtered water is pressurized and passed through RO (reverse osmosis) membrane with a pore size of 1/10000 micron, so that water molecules and ionic mineral elements pass through the reverse osmosis membrane, while most inorganic salts (including heavy metals), organic substances, bacteria and viruses dissolved in the water cannot pass through the reverse osmosis membrane, thus making it permeate.
Comments: Filter out all substances over one ten thousandth of a micron in tap water, with high purity. However, the water purifier can not remove some smaller acidic substances in the water while filtering minerals. The effluent is basically acidic water with pH below 6, which is lower than the national standard. Some people think that drinking acidic water and water with low mineral trace elements for a long time is not good for human health. Although some manufacturers claim to have added mineral slow-release materials, the actual effect has not been achieved. In addition, water production also produces about 50% wastewater with no use value.
2. Ultrafiltration water purifier: The municipal water supply source water enters the ultrafiltration membrane tube after primary treatment such as particle filtration and activated carbon adsorption. Under the action of water pressure difference, many 0.0 1 micron micropores on the membrane surface only allow water molecules, beneficial minerals and trace elements to penetrate and become purified water. However, harmful substances such as bacteria, rust, colloid, sediment, suspended matter and macromolecular organic matter are trapped in the ultrafiltration membrane tube and discharged when the ultrafiltration membrane is cleaned.
Comments: The degree of water purification is slightly lower than that of water purifier. It is not recommended to use in areas with poor water quality and high hardness, and it is not available in areas with serious acid pollution and heavy metal pollution. Some manufacturers mix all kinds of filter materials, such as softening filter element, mineralizing filter element, replacing heavy metal filter element and sterilizing filter element. Contradictory theories can often be said to be exaggerated.
3. Soft water of water softener is hard water, which is filtered by resin polymer materials to exchange metal ions in water. Simple combined filter.
Comments: Calcium and magnesium ions are often exchanged, and the substances released into water by different exchange substances are different and cannot be constant. Simple filtration is not needed in areas with good water quality, and the effect is not good in areas with poor water quality. It is not recommended to be used as drinking water equipment.
4. Electrolyzed water generator: the municipal water supply is filtered by the pre-filter, and the obtained purified water enters the electrolytic cell. The separation membrane is used as the medium to apply DC voltage to the water, and the water is decomposed by the electrolytic plate, thus separating weak alkaline water and weak acidic water. Because minerals such as calcium, magnesium, sodium and potassium in water are mostly concentrated in the cathode, hydroxyl ions (OH-) increase and become weakly alkaline water. Oxygen, sulfuric acid, sulfur, etc. It is induced to the anode, increasing hydrogen ions (H+) and producing weakly acidic water.
Comments: The products launched by health care products enterprises have high prices and serious after-sales service problems. Like water purifiers, experts have great differences, but most of them agree with weakly alkaline water, and some manufacturers even applied for "medical device registration certificate". Drinking alkaline electrolyzed water with PH higher than 8.5 requires close attention to physical condition. The primary filtration is not precise enough, and filter materials need to be added or replaced in areas with hard water and serious heavy metal pollution. An electrolytic water purifier with proper configuration (filtration), excellent quality, moderate price (below 3500) and guaranteed after-sales (brand) is a better choice for household water purifiers.