Rechargable Water Filter designed for the Carver/Truma Crystal MK1 & " Housing.
 
Unscrew the old filter, using the Filtapac removing toolif necessary. Lubricate the O ring seal with vegetable oil to ease fitting and screw the cartridge fully into the housing, but only as far as stop moulded into the thread. Flush cold water through the filter until the water runs clear (for few seconds water may run black)
Your filter should be replaced after 30 days of use or 12 months whichever is the sooner (or recharge using a Filtapac recharge kit)
 
It is advisable to remove the carbon from the filter before sterilising your system.