Bring Quality into your life with BWT Magnesium Mineralizer In Line Drinking Water Filtration - Unforgettable refreshing water for your drinking enjoyment! Replacement 6 month Filter cartridge Features Cost Effective Easy to Install With Patented Magnesium Technology Cartridge lasts from 3 to 6 months, dependent on hard water area Reduces sediment, odours unpleasant tastes Unique BWT compact size filtration The Inline Drinking Water Filter Kit from BWT is innovatively designed to save space; their compact size makes them ideal for where space is limited, and the benefit of not needing a separate housing is really useful. The Drinking Water Filter Kit is supplied with all the necessary fitting including a self-piercing valve, connecting pipes, smart quarter turn tap and.