The current domestic water purifiers are all filter technology, and the filtering technology should follow the order of the filter pores from big to small. Only the activated carbon as a filter material, as well as the adsorption function, can remove the heterochromatic, odor, residual chlorine, some organic substances and some trace heavy metals in the water. Especially for non-reverse osmosis water purifiers (known as the general water purifier device), activated carbon is an important means of adsorbing harmful organics, so the activated carbon filter is essential in the water purifier, and other filter elements cannot be replaced. For the RO process, because the residual chlorine has a large influence on the RO membrane, it will lead to a decrease in the desalination rate, and the activated carbon needs to be pretreated to protect the RO membrane and prolong its service life. Visible, reverse osmosis water purifier (ie, RO) pre-activated carbon filter cartridges are standard.

TIPs:

1. The adsorption of heavy metals by activated carbon is selective, ie, it cannot absorb all heavy metals: its removal is also insignificant, so activated carbon is not a reliable means of removing heavy metals. Even modified activated carbon (for certain metals, the addition of special adsorbent chelating agents to activated carbon, etc.) is only aimed at a certain metal (for example, Amway, which has a deep background in the research and development of activated carbon technology, only advertises Hg and Pb have very good results, and the purification performance of septum and arsenic is not perfect. Five highly toxic heavy metals that are harmful to the human body cannot be removed at the same time. Because the effluent heavy metal content of the water plant is basically very low, some manufacturers will wipe the ball and promote publicity. This has been exposed (such as 3M) and should not be misled;

2. Removal of TOC: In China, due to serious industrial pollution, removal of TOC is very important. Without the use of RO process water purifiers, the choice of activated carbon filter is one of the key factors that determine the TOC removal effect.

3. For southern China, the hardness is not high, but the economy is developed, the industrial pollution is higher, and the residual chlorine is higher, so the home ring evaluation reminds us that we still have to choose a higher activated carbon adsorption value or more . For areas with high hardness, it is better to add a filter that can resist scale or soften.

4. Dow reverse osmosis components that are widely used at present are mostly low-pressure polyamide membranes. The membranes are not resistant to chlorine during use, and they are easily oxidized to cause permanent damage, especially under the action of heavy metal ions. Tap water contains heavy metal ions, which can easily damage the membrane after the activated carbon has failed. The content of residual chlorine and organic matter in tap water is changed, and replacement of activated carbon rods is not enough by calculation and estimation alone.

5. For activated carbon filters, adsorption requires a certain contact time and the water flow rate cannot be too fast. According to the standard JB/T2932-1999 "Technical conditions of water treatment equipment": Activated carbon filter to remove free chlorine in water, the water flow rate must be ≤ 20m / h, and to remove organic matter in water, the water flow rate must be ≤ 10m / h.