Here are a few standard procedures for replacing a mixer tap cartridge: 

 

Turn off the tap's water supply. Typically, this is accomplished by closing the valves behind the wall or under the sink. 

 

To confirm that there is no water remaining in the pipes and to release any pressure in the lines, open the tap. 

 

Take the tap's handle off. Typically, to do this, a screw or clip holding the handle in place must be removed. 

 

You ought should be able to see the cartridge inside the tap body once the handle has been taken off. 

 

The outdated cartridge should be taken out of the tap using a cartridge puller or a pair of pliers. 

 

Once the old cartridge has been eliminated, check the tap body for any buildup or debris that might be the source of the issue. If required, clean the tap body. 

 

Make that the replacement cartridge is correctly placed and aligned before inserting it into the tap body. 

 

Reinstall the handle, then restart the water flow. 

 

Check the tap's functionality by turning it on and off.