With the 600L Grohe Blue filter cartridge in standard size, you always have ready-to-serve, filtered drinking water available in unlimited quantities. When used with the Grohe Blue water system, this filter cartridge passes water through five filtration stages to remove all unwanted substances, including heavy metals. It also reduces lime content and delivers a great, fresh taste. Changing the filter cartridge is easy – simply twist out the old cartridge and twist in the new one. The convenient way to enjoy pure, delicious drinking water directly from your tap.