Plop one of these in the toilet once a week for a constantly clean and fresh bowl. Plop one in the bowl of the toilet and let sit for 10 minutes. Think of these as a bath bomb for the loo. Formulated with organic ingredients, we use Organic Tea Tree and Rosemary essential oils to keep things clean and Ingredients: Non-GMO citric acid, aluminum-free sodium bicarbonate, tea tree oil, witch hazel, and rosemary oil. 12 1” x 1” tabs.