Household water purifiers began in 1950s and became popular in 1970s until now. Especially in the twentieth century, the United States first discovered the existence of disinfection by-products in tap water. Many families in the United States began to install and use as a family self-protection device.
 

      When a process is difficult to remove harmful substances in water, two or more than two processes are used as composite types. Such as activated carbon adsorption, ultraviolet sterilization, activated carbon adsorption, reverse osmosis, activated carbon adsorption, micro filtration (ultra filtration), polypropylene fiber, carbon, micro filtration (ultra filtration) etc. membrane technology in composite water purifier has excellent performance, particularly in the removal of microorganisms (bacteria and algae), it has significant effect, the water from some good quality water purifier can be drunk directly, has been welcomed by the vast number of consumers , it has become a hotspot in the development of water purification.

      From the classification of the above water purifier, it is not difficult to see that the household water purifier is essentially the miniaturization of the advanced treatment of water supply, the main object of which is the turbid, chromed, smelly and organic matter in the tap water. It is generally composed of three parts: pre filtration (coarse filtration), adsorption, fine filtration (micro filtration, ultra filtration, reverse osmosis) and so on. Adsorption (usually using activated carbon adsorption) and fine filtration are the main means to remove organic matter, smelly and chromed in water, and the existing operation condition directly affects the effluent water quality of water purifier. Household water purifier serves tens of thousands of households, but because the water use area, water conditions vary, users lack the necessary knowledge of the operation, and the product design is unable to cope with the myriads of changes situation, water purifier manufacturers therefore should be considered for users to master certain professional knowledge, the standardization of the installation and operation of the net water heater, to make the water to reach the ideal effect.

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