1 . replace the filter before the total water valve closed .

2 . and then open the faucet , let it discharge pressure .

3 . then use the wrench from the bottom to the top of the filter bottle , hold down the top of the bottle , wrench clockwise unscrew the bottle .

4 . unscrew the filter after the pollution lost , put the filter into it, and then to the front filter connected to the water .

5 . the wrench twist the filter bottle counterclockwise , then open the main valve , open the tap over the water for 1-2 minutes , and check whether the water leakage , row of the filter bottle of water and air to ensure clean and air pressure, while front Filter bottle watertight is a success ! 

The role of the pre-filter is the initial water filtration of the whole house , mainly in the filter pipe network of sediment , rust , and large particulate matter . Now the phenomenon of secondary pollution of water pipe is more serious , tap water through our home to the inside there will be a lot of impurities , filter out these impurities , to avoid the human body and skin damage , but also to protect the home water purifier , water heater , flower Sprinkler, faucet and other facilities . And the pre-filter life is very long , a lifetime benefit of installation , so pre-installed filter is necessary .