Fight stains, Soften clothes, Brighten whites. - One Half Tablespoon per large load when you need it. - Treats 80+ Large Washloads - Hard water is a problem for laundry. Normal laundry boosters can leave a dingy, stiff and irritating residue on your clothes. - Certain phosphates can safely eliminate these problems and be environmentally friendly. They become a problem only with overuse. - Charlie's Soap Laundry Booster and Hard Water Treatment uses a biodegradable phosphate that leaves no residue on your clothes while softening your wash water. - Use this booster when you have trouble with hard water or difficult stains. Keep your clothes and the environment clean.