【EFFECTIVE IN DEODORIZING AND CLEANING】 - Effectively help you clean the tank, water pipe and other parts of the toilet. Deodorize and freshen the toilet bowl, leaving a fresh scent with no pungent odor. Vacplus natural toilet bowl cleaner reduces the speed of your tank getting dirty and the frequency of cleaning the tank.【LONG-LASTING】 - Designed with a slow release technique, each toilet cleaner tablet lasts up to 5-7 Days (or 20 flushes daily), 12 tablets are for 2-3months supply. BTW, the lifetime of each toilet tablet may vary due to different water temperature and using frequency.【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 10 minutes 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.【SEPTIC SAFE】 - Vacplus toilet cleaner is convenient and easy to use. It helps prevent the accumulation of hard water stains and does not contain bleach. It is safe for septic tank systems and will not cause any damage to the internal parts of the toilet tank.