• Cleanballs - long-lasting eco-friendly anti-scale device for external and built-in toilet tanks. • Package of 1 case, lasts for 6 months. • Innovative patented system to soften water, specific for external and built-in toilet tanks. • The special enzyme in the spheres acts naturally by reducing water hardness. • Prevents the formation of lime scale and stains on toilet walls. • Keeps the drain functioning perfectly and the bathroom clean. • Cleanballs allows reducing the frequency of treatments with aggressive cleaning acids. • Does not release chemicals. • Ideal for all types of internal and external WC cisterns. • Open the cistern and attach the bag's hook to a fixed part inside the cistern. • Insert the bag into the cistern so that it is submerged in the water. • Replacement is recommended every 6 months. • WARNINGS - Do not open the bag and disperse the spheres. • Keep out of reach of children.