This calculation is based on the pollution values from tannery processes under good practice conditions. Therefore, it is reasonable to assume that wastewater and chromium released in tanneries are much higher than the amounts mentioned above. It is important to note that the consumption of water per kilogram of tanned hide or skin can vary dramatically
depending on the hide or skin type: from 2 L to obtain bovine leather for shoes to 20 L for double-face fur.