This automatic toilet bowl cleaner uses modern cleaning technology to successfully remove urine scale from the toilet bowl. It has active factor cleaning technology, will not be bad to the tank, drain pipe and bottom wax seal. It each toilet tab let can last about 15 days. It makes your toilet sparkly clean. easy to use, drop these tablets into your toilet tank and the toilet bowl gets cleaned every time you flush. It has natural and scent free formula is suitable for anyone, especially the people who is allergic to the scent. Effective in killing bacteria and germs of the toilet and sewer pipe, preventing bacteria from toilet and toilet sewer infected alternately.