Sonett Ecological Hard Water Descaler Decalcifier, 1 liter/34 fl.oz. Removes stubborn hard water deposits from small and large applicances. Descales dishwashers, washing machines, dehumidifiers, coffee machines, water boilers, toilets, etc. Made from natural food-grade ingredients 100% biodegradable. Safe for septic systems and filtration system. Certified by ECOguarantie, ecoControl, and Reg. by Vegan Society.