Ecozone Forever Flush Twin Pack Toilet Block is an innovative alternative to toilet rim hangers, that instead sits discretely in your toilet cistern for up to 5 months. Encased in a fully recyclable exterior, the block is designed in a way that it gradually releases the solution inside when its penetrated with water. Once you flush, the sanitised water (either blue, violet or mint green) filters into the toilet bowl, cleansing and descaling your toilet in one. Available in original single and twin pack, indigo and jade options. It is advised to use your toilet brush to maintain a thorough clean as often as needed. Cleans, sanitises & descales toilet bowl on every flush Biodegradable & natural formula Non toxic & septic tank safe Simply pop the small jar into the cistern where Forever Flush toilet block will continue to work effectively for up to 2000 flushes, helping to prevent stains and limescale. The blue water indicates the toilet bowl is sanitary, stain free and deodorised. Non-toxic Biodegradable Safe for septic tanks.