A BWT subscription allows you to order products that you need on a recurring basis (e.g. hygiene safe) at a delivery frequency and address of your choice, so that you always have enough in stock.
This service is therefore also time-saving, as you do not have to go to the trouble of always repeating the order. Furthermore, some BWT devices (e.g. BWT Perla) - when you take out a subscription - automatically order the consumables when they are needed.