Hands-free automatic toilet bowl cleaner. Just remove the tab and drop one tablet into the toilet tank. It uses sustained-release technology to release an ultra-strength concentrated cleaning solution with every flush. Cleans, breaks down stains and residue, deodorizes, and freshens the bowl for up to 3 months. The water turns blue while it is working (“If the water is blue, Mer-Maid is working for you”). It is marketed as equal to about 30 gel tabs of leading brands in cleaning power over its life. Does not fully replace weekly brushing/scrubbing for heavily soiled bowls or buildup (manufacturer notes it does...