Sehan's predecessor was a water treatment subsidiary of South Korea's Samsung Group, which was spun off from Samsung in 1995. Sehan has strong strength in the R&D and production of reverse osmosis membranes, and is one of the few manufacturers in the world that can produce RO membranes on a large scale, but Sehan's RO membranes still have a lot of room for improvement compared with first-line brands, and their market share in the industrial field is not high. Because the RO membrane is produced by itself, the replacement cost of the water purifier filter element of Shihan is low, and the RO membrane with a specification of 400G is sold at about 400 yuan, which is more affordable than many brands of RO membrane filter elements of 1,000 yuan.
 
There are not many product models of Shihan, all of which are reverse osmosis water purifiers, and the products are positioned in the high-end market, and the price is generally more than 3,000 yuan. The first-stage filter layer of its high-end model CW-2000U-4S is conventional PP cotton, which can filter large particles of pollutants such as sediment, rust and bloodworms; The second stage filter layer is made of Kuraray coconut shell activated carbon imported from Japan, with an adsorption iodine value of up to 1000, which can strongly adsorb residual chlorine and other odor molecules in water; The third layer is an ultrafiltration membrane element with an accuracy of 0.01 microns, which further retains suspended solids, colloids and microorganisms. The fourth layer is naturally a self-produced 400G high-flux RO membrane; The last stage also uses Japanese Kuraray activated carbon, but the iodine value is increased to 1500, which can further improve the taste of the purified water and ensure that the water is sweet and refreshing.
 
Since the CW-2000U-4S integrates the ultrafiltration membrane into the reverse osmosis water purifier, the dual water outlet function will naturally not be absent. CW-2000U-4S comes with a double water faucet, when dealing with water scenarios such as washing, cleansing, washing vegetables and fruits, ultra-filtered water with relatively low filtration accuracy can meet the requirements, while RO pure water is more suitable for direct drinking and cooking, the double water outlet design greatly expands the use of water purifiers, and is also the embodiment of Sehan's humanized product concept.
 
The appearance design of the Shihan water purifier inherits the Korean brand's pursuit of shape, the overall style is fashionable and stable, the shell combined with glass and metal perfectly covers up the rough style and uninhibited line shape of the traditional water purifier, to meet the consumer's pursuit of quality life, the built-in display screen on the top of the water purifier further enhances the sense of science and technology of the product, but for the water purifier hidden under the kitchen all year round, perhaps other life reminder methods will be more practical.