2. Look at the filter element. The so-called "look at the filter element" is divided into two aspects. First, it depends on the number of filter elements. Of course, the number of filter elements is not as large as possible. Too many filter elements will bring problems such as too little water.
On the other hand, it also depends on the filtering performance of the filter element. For example, Angel's long-acting reverse osmosis membrane can filter impurities such as bacteria, viruses and heavy metals, and can be used for up to 5 years. Now it has obtained the top ten innovative patents in the world and six international authoritative certifications.
Patent USPRO composite filter combines folding ultrafiltration membrane with high-temperature solidified activated carbon, which can not only effectively filter colloid, organic matter and other substances, but also remove residual chlorine and improve drinking taste.
3. Look at the waste water ratio. Wastewater ratio is a unique concept of RO water purifier. Due to the special working principle of RO water purifier, a cup of pure water will be produced, and a certain amount of wastewater will be produced correspondingly, which will be discharged through the drainage pipe. The waste water ratio of ordinary RO water purifier is about 1:3, and it produces one cup of pure water and three cups of waste water at the same time, which is not ideal in terms of energy saving, environmental protection and user experience. Angel's A7Lite water purifier achieved the effect of 3: 1.