Forever Flush 2000™ Up to 2000 flushes! Forever Rush Toilet Block will work effectively for up to 2000 flushes, helping to prevent stains & limescale. The coloured water indicates the toilet bowl is sanitary & deordorised. Place the Toilet Block into the cistem of your toilet. Leave in toilet cistem until product has finished. To remove, tum the Jar upside down and drain, then place in a bag for disposal.