Dometic’s 3 in 1 is the premier Bowl and tank treatment. It allows users to clean and deodorize their toilet bowl and holding tank with one product. The rapid dissolving drop-in packets are pre-dosed. Shortly after the packet contacts, water users will notice the effervescent cleaning action. At this time the product will release its pleasant lavender scent. 3 in 1 is Formaldehyde free and uses a proprietary enzyme to superior results.