This product is a gel type purifying agent that releases active factors after expansion and condensation when encountering water, absorbing harmful gases in the air, effectively absorbing scattered soot, preventing soot from floating around, and preventing it from not burning. Easy to clean, safe and non-toxic. Pour the used colloid and cigarette butts into the garbage can and wash them away with clean water. They are clean and free of soot, and the ashtray will never turn yellow again. To use, take out the independent package, cut it, and pour it into the ashtray to show white particles. Add 150ML of clear water and warm water into the ashtray, and let it stand for 30 seconds to 60 seconds, until it absorbs water and expands, and condenses into a snowflake gel, then it can be used.