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The GROHE Blue Cleaning cartridge keeps your GROHE Blue system clean and in perfect working order – and that means delicious tasting water straight from the tap! Use with the dedicated GROHE adapter (40694000) for perfect cleaning power. The cleaning agent, which guarantees 100% biological disinfection, is not harmful to humans. And the empty bottle is recyclable too. The GROHE Blue cleaning cartridge – helping to keep water pure. N.B. You can't use the cleaning cartridge without the adapter.