Our return system of refillable containers / bottles suits our ecological mentality perfectly. This means no spilling of precious materials such as the one-way barrels, but most importantly, no chemical waste. Ever. Due to the round shape of the bottle's bottom and the riser herein we assure a totally automatic emptying in strong contrast to the conventional flat-bottomed drums in which a tilting of the vessel is required for the drum to get more or less empty. So our customers are confident that their canisters are empty when the automatic detection announces this.