Remember to shut off the main water line and alleviate pressure. For heads with integrated vent, unscrew the brass screws to lower the pressure inside the filter housing.

Use the appropriate wrench to unscrew the clamp that holds the crown transparent or opaque jar against the head. Once the bowl is released, remove the cartridge inside.
It is advisable to replace the O-ring on each cartridge change to avoid crushing formation during screwing.
Insert a new cartridge into the jar. For the cartridge washable nylon, rinse with running water underneath the tap for a few minutes filtered to remove impurities.
Tighten the crown on the head without the seal is too crushed.
Turn right cartridge about 1/4 turn until rotation stops.
Turn the handle water supply.