Hi Michelle, that depends on how much water is drawn. If you aren't sure, you should start with the S-size filter (No. 40404001). There is no point in taking the L-size filter straight away, as the filter should be changed after a year for hygienic reasons, regardless of whether the filter capacity has been reached or not. Furthermore, the carbonate hardness is decisive. If your water supplier supplies water with a carbonate hardness of less than 9 degrees, the activated carbon filter (No. 40547001) must be used. Kind regards your GROHE Social Team

Hello Mark, the hose that goes up to the faucet with the sparkling water. 😉 Kind regards, Your GROHE Social Team

Hi Mark, the system must be cleaned once a year using the cleaning cartridge 40434001. To do this, you need the adapter for the cleaning cartridge 40694000 once (this adapter is already included with the Grohe Blue Professional). If the system is operated in a public / commercial area (e.g. in the kitchen of a company), cleaning must be carried out twice a year. The filter must be replaced after the capacity limit has been reached or after a year (depending on which event occurs first). Kind regards, Your GROHE Social Team

Hello Rick, from 13:08 onwards you can see how the gas-cylinder is installed. If you have any further questions about this process, please let us know! Kind regards, Your GROHE Social Team

Hello, you can find your nearest GROHE supplier on our website: www.grohe.com.vn/vi_vn/dich-vu/tim-kiem-cua-hang/#/locator/ Kind regards, Your GROHE Social Team