Nu-Calgon has developed the Green Select products with all natural ingredients derived from vegetable esters and other eco-friendly resources. All of the Green Select products have been tested extensively to ensure the highest level of performance while utilizing more eco-friendly ingredients. In addition, the products are biodegradable and will not harm plants, animals, and aquatic life. More importantly, we use only natural and renewable resources that are on the EPA's Safer Choice Direct Release Program list of acceptable eco-friendly ingredients.