What are the five filter cartridges of the water purifier?

Primary 5 micron PP filter: used as primary filtration to remove coarse particles such as sediment and rust in water.
Secondary particle activated carbon filter: adsorption for heterochromatic, odor, organic substances, etc. in water.
Three-stage 1 micron PP filter: further remove smaller particles, suspended solids and colloids in water.
Four-stage RO reverse osmosis membrane: remove all residual chlorine, inorganic impurities, bacteria, viruses, heavy metals and other pollutants in the water.
Five-stage rear coconut shell activated carbon filter: It is made of coconut shell active to improve the taste of water and make the drinking water more sweet and refreshing.