TaBaChem (Take Back Chemicals) combines the principles of a closed circuit and chemical leasing®. The traditional sales model under which chemicals are bought, used and possibly taken back as waste has been transformed into a new model. In this leasing model, the chemicals are not sold as a product but as a service, where both the user and the supplier/producer strive for a minimum use of chemical processes. Then residual flows are cut and/or chemical products are taken back. A practical example to illustrate how it works: instead of buying chemicals to maintain a machine, you could purchase the cleaning of the installation.