RES-CLEAN Resin cleaner 250ml for all types of water softeners. Set the softener to regenerate manually and then add the RES cleaner. Subsequently, resin in the cylinder is simply cleaned by means of a chemical process. The RES cleaner is biodegradable. By using the product once a year you ensure that your resin remains in good condition and does not become saturated. In addition, it prevents bacteria in the resin cylinder. With 1 bottle you can do 2 treatments.