Enjoy filtered drinking water directly from the faucet with the 1500L Grohe Blue filter cartridge in medium size. 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 simple - just twist out the old cartridge and twist in the new one. The convenient way to enjoy pure, delicious drinking water right from your faucet.