■ Ultrafiltration water purifier simply filters out sediment, colloid and bacteria, and cannot filter out scale, heavy metals and chemical pollutants, and cannot improve the taste; External pressure type can not flush and drain, internal pressure type can flush and drain. Its advantages are: no electricity, no waste of water, large flow and long filter life (1-5 years).
■ Activated carbon water purifier can absorb different colors and smells, improve the taste, and cannot filter out scale, heavy metals and chemical pollutants. There is little difference between boiling and drinking, making tea and tap water, and there are secondary pollution problems such as bacterial growth and excessive nitrite. It is easy to saturate and fail, and needs to be replaced once every six months to ensure water quality and health and safety; Advantages: no electricity and no waste of water.
■ Reverse osmosis water purifier (water purifier) can filter out scale, heavy metals and chemical pollutants, and completely improve water quality and taste. Disadvantages are: slow water production, waste of water and electricity, and troublesome installation and maintenance.
■ In view of the shortcomings of the traditional reverse osmosis water purifier, some enterprises have successfully developed a dual-membrane dual-intelligent water purifier integrating ultrafiltration membrane, activated carbon fiber and RO membrane, which has the function of "washing the membrane with water" (invention patent number: ZL 2012103061455), intelligently judging the water source status and filter element status, and intelligently adjusting the washing mode.
Judging from the sampling results of previous quality supervision and health departments, the unqualified rate of activated carbon water purifier is the highest, followed by ultrafiltration water purifier, and reverse osmosis water purifier (water purifier) is the safest and most reassuring.
■ Pre-filter is mainly used to filter out large particles of rust and sediment. It can protect the water purifier and prolong the service life of the filter element of the water purifier under the condition that the raw water is turbid and there are a lot of rust and sediment.
Water purifiers are afraid of freezing. Anti-freezing measures should be taken in winter to prevent freezing. The water production speed of reverse osmosis water purifier (RO machine) is greatly influenced by temperature. The lower the temperature, the slower the water production.