These tabs made with Lemon & Peppermint essential oils work great and use no harsh chemicals that will harm the environment . Just pop one into your toilet bowl and watch it foam and whiten, and then just clean with your toilet bowl brush as normal and flush. Will make you bowl clean and fresh and your bathroom will smell lovely also. Ingredients are Baking Soda, Citric Acid, Kaolin Clay, Sodium Borate, Lathanol, and essential oils.