4Cartridge Replacement1. Turn black top to By-Pass or Off (By-Pass will allow water to continueto flow to the rest of the house while you replace the Cartridge). Use theWrench provided if necessary.2. Turn the bottom blue Collar counter clockwise and slide down tobottom of the Housing. (Be sure to firmly support the Housing as youloosen the Collar to prevent it from falling). Use the Wrench provided ifnecessary.3. Slide the Housing away from the Head.4. Remove the spent Cartridge and insert the Replacement Cartridge(be sure the two Dispensing Holes are at the top).5. Inspect the O-Ring at the top of the Housing and ensure that it isseated properly.6. Slide the Housing back under the Head and lift and tighten the Collarby turning clockwise. Secure the Collar with the wrench provided.7. Turn the black top to Softener to resume water flow.8. Check for leaks. If leaks exist, confirm that the bottom Collar istightened securely to the Head.If leaks persist, return the black top to By-Pass or Off, remove the Collar,slide the Housing away from the Head and check that the O-Ring is ingood condition and properly seated. Reattach the Housing as beforeand repeat steps 7-9.