1PC Mer-Maid Automatic Toilet Bowl CleanerMER MAID automatic toilet bowl cleaner is the easy solution to keeping your toilet clean. It works hard so you dont have to. If the water is blue, MER MAID is working for you! Cleans and freshens your toilet bowl. Its so easy! Just remove the yellow tab, place it upright it in your toilet tank and MER MAID will clean your toilet with every flush for up to 3 months! CRYSTALLINE GEL; NOT SEPTIC TANK SAFE. Flat bottom bottle sits upright in your toilet