To place a new filter module:
1. Prepare the new O-rings and filter module: see STEP 4 Prepare the O-rings and filter module within Installing the UrSpring
2. Place a new filter module: see STEP 5 Place the filter module within Installing the UrSpring
3. Enter the 7 digit serial key of the new filter module in the control unit. see Enter the serial key (SK).

You may need to start with:
Preparation
Remove filter module