Vacplus Automatic Toilet Bowl Cleaner Tablets, Bathroom Toilet Tank Cleaner (12 PACK), VA-T165 12 Count (Pack of 1)

EFFECTIVE IN CLEANING - Effectively help you clean the tank, water pipe and other parts of the toilet.
LONG-LASTING - Each toilet cleaner tablet lasts up to 15 Days (or 20 flushes daily), 12 tablets are for 6 months supply. BTW, each toilet tablet's lifetime may vary.
HOW TO USE - DO NOT tear off the blue outer protective film, which is soluble in water tank directly. Please leave the toilet tank cleaner in the water tank for at least 1 hours to dissolve sufficiently until water gets blue before flushing.
POINTS FOR ATTENTION - When the blue toilet bowl tablet dissolves completely, the blue will fade, a new toilet tank cleaner should be put into the tank. This product cannot completely replace the toilet brush. It is mainly to help maintain a clean toilet tank and reduce the dirt accumulation on the tank. Please clean the toilet tank with a toilet brush before the first-time use, so as to make a better use of this product.
CONVENIENT AND EASY TO USE - Vacplus toilet cleaner is convenient and easy to use. It will not cause any damage to the internal parts of the toilet tank.