The pressure barrel leaks air or the skin is damaged, the ball valve of the pressure barrel fails, and then the activated carbon is blocked. You can replace it like this:

1. First, close the water inlet valve of the water purifier, turn on the faucet of the water purifier, and drain the residual water.

2. Secondly, take out the water purifier, unplug the water pipe connected with the water purifier, and take out the water purifier.

3. Then replace the filter element, rotate and take out the filter element, take out the old filter element and replace it with a new filter element. Remove the main cover, pull out the ultrafiltration membrane and replace it with a new one.

4. Finally, install the water purifier and connect the water pipe of the water purifier, plug in the socket and open the water valve to complete the replacement.