The Toilet Cleaner Effervescent Bowl Cleaner is a convenient and effective solution for keeping your toilet clean and odor-free. It is designed to dissolve slowly, ensuring long-lasting freshness. The color of the cleaning paste may appear lighter or non-existent in the first three days, but it will evenly display its color after that. With household use, one bottle of this cleaner can last for 2-3 months, making it a cost-effective choice. However, in public places, the usage time may be shorter. Please note that the time it takes for the color to be displayed may vary depending on the type of toilet tank. It can be as fast as 2 hours or as long as 3 days. While this cleaner helps remove odors and keeps the toilet clean, it is important to manually clean any existing dirt before using it. Please also note that it is suitable for regular size toilet tanks, but may not be compatible with smaller tanks found in smart toilets. Key Features: Slow-dissolving formula for long-lasting freshness Cost-effective, lasts 2-3 months Color display varies based on toilet tank type Helps remove odors Suitable for regular size toilet tanks