Water purifiers are mainly divided into ultrafiltration water purifiers, activated carbon water purifiers and reverse osmosis water purifiers (RO machines).

■Ultrafiltration water purifiers only simply filter out sediment, colloids and bacteria, but cannot filter out scale, heavy metals and chemical pollutants, and cannot improve the taste; external pressure water purifiers cannot flush and discharge sewage, and internal pressure cannot The type can be flushed and drained. The advantages are: no electricity, no waste of water, large flow rate, long filter life (1-5 years)

■Activated carbon water purifier, which can absorb peculiar colors and odors and improve the taste , cannot filter out scale, heavy metals and chemical pollutants. It is not much different from tap water when boiled for drinking or making tea. It also has secondary pollution problems such as bacterial growth and excessive nitrite. It is prone to saturation and failure and needs to be replaced every six months or so to ensure that it is guaranteed. Water quality and health safety; the advantages are: no electricity and no waste of water.

■Reverse osmosis water purifier (pure water machine) can filter out scale, heavy metals and chemical pollutants, completely improving water quality and taste. The disadvantages are: slow water production, waste of water, electricity consumption, and troublesome installation and maintenance

■In response to the shortcomings of traditional reverse osmosis water purifiers, some companies have successfully developed a system that combines "ultrafiltration membrane, activated carbon fiber and RO A dual-membrane dual-smart water purifier integrating "membrane" with a "water purification membrane" function (invention patent number: ZL2012103061455), which intelligently determines water source conditions and filter element status, intelligently adjusts the flushing method, and solves the problem of slow water flow in the traditional RO mechanism. , a lot of waste water, short filter life, high use costs and other shortcomings.

Judging from the random inspection results of previous quality supervision and health departments, activated carbon water purifiers have the highest failure rate, followed by ultrafiltration water purifiers, and reverse osmosis water purifiers (pure water machines) are the safest and most Most assured.

■The pre-filter is mainly used to filter out large particles of rust and sediment. When the raw water is turbid and contains a lot of rust and sediment, it can protect the water purifier and extend the service life of the water purifier filter element.

Water purifiers are afraid of freezing. Antifreeze measures are required in winter to prevent freezing. The water production speed of a reverse osmosis water purifier (RO machine) is greatly affected by temperature. The lower the temperature, the slower the water production.