Crystal Water Filter Replacement Media - 6L INSTALLATION & USE 6L replacement media for the Crystal water filter.Changing the media is a simple process. Please see ' Downloads ' tab for instructions. Crystal Water Filter - For Cars and Windows Mains water contains impurities and salts which leave spots and smears on the paint after washing. Some of this will be due to scale caused by Calcium and Manganese. A water softener will remove Calcium and Magnesium and therefore preventing scale formation.  However, some impurities remain and if you want a spot and smear-free finish on your paintwork then our specifically designed car wash filter is the best for this.Our filter has been specifically designed to provide ultra-pure water for the washing of cars and windows. Inside the housing is a special media that removes all impurities from water. This means that when water evaporates on paintwork or glass, no spots or streaks are left behind , leaving you with a perfect finish.Th