Generally speaking, the price of ultrafiltration water purifier is relatively low, and it can only filter out large particles such as rust and sediment in water, but the filtering ability of small molecules dissolved organic carbon (DOC), heavy metals and other harmful substances is weak.
Reverse osmosis water purifier, that is, RO membrane filtration, is more expensive than ultrafiltration water purifier, but it can effectively filter out harmful substances in water, and the filtered water is basically pure water, which can solve the problems of scale and water-alkali well.
Nanofiltration is a pressure-driven membrane separation process between reverse osmosis and ultrafiltration, which is used to separate substances with relatively small molecular weight, such as inorganic salts or small molecular organic substances such as glucose and sucrose from solvents. In other words, it allows inorganic salts and some solvents to pass through the membrane, which is better than ultrafiltration water purifier, but not as effective as reverse osmosis membrane.
Therefore, if you want to buy a satisfactory household water purifier, then choose Angel reverse osmosis water purifier, which is your first choice for pursuing quality.
Angel is the earliest and only independent brand focusing on clean drinking water in China. The company is positioned as a high-end water purification expert and signed an international superstar Gong Li as its global brand spokesperson. At present, Angel's products have sold well in 65 countries, including the United States and Japan, and won the choice of 200 million people around the world. Founded in 1987, the company has 33 years of experience in water purification industry.