Many water purifiers, filter buckets and reverse osmosis pure water machines are mostly equipped with activated carbon filters. The activated carbon filter element is a hollow cylindrical filter element of various sizes, which is extruded with granular activated carbon mixed with a low hot melt adhesive.

The activated carbon used has the following types:
1. Coal columnar activated carbon with good treatment effect on chemical oxygen consumption;
2. Coconut shell activated carbon with better removal ability for trihalomethane;
3, with a variety of performance of coal activated carbon mixed coconut shell activated carbon;
4. Bactericidal carbon with inhibitory effect on bacteria.

The surface of the filter element is commonly wrapped with polypropylene non-woven fabric and polyethylene mesh to increase the pre-filtration and service life. There is a polypropylene non-woven fabric inside the filter core to prevent the activated carbon of the filter core from entering the filter water. The density structure of the filter element is relatively loose in the outer layer and tight in the inner layer, the loose outer layer can reduce the pressure difference and increase the amount of pollution, and the tight inner layer can improve the adsorption capacity and better play the efficiency of activated carbon treatment of water.

In the device of reverse osmosis water purification process, activated carbon is often necessary, such as:

(1) tap water or groundwater intake;

(2) Through the fiber filter (remove rust, copper rust, silt, sand, etc.)

(3) Granular activated carbon filter (remove chlorine odor in water, trichloromethane pesticides, etc.)

(4) Filtered by activated carbon rod (again remove various odors and organic matter, etc.);

(5) Through reverse osmosis membrane (remove bacteria, salt, heavy metals, minerals, etc.)

(6) After sterilization charcoal (sterilization, adjust the taste of pure water) to drink pure water.

Tap water from pipes contains trace amounts of chlorine, which can inhibit the growth of bacteria in the water. However, after activated carbon water purification, chlorine is adsorbed, if the water is stopped for a long time, the limited trace amount of chlorine retained in the water in the water purifier can not inhibit bacterial reproduction, so the anaerobic bacteria in the water in the water purifier is easy to reproduce, there will be isoodor and nitrite.