Toilet Additives - Black water tank produced for Thetford toilet care for over 35 years, Thetford has been developing toilet care products that ensure the proper functioning of our portable and cassette toilets. Researchers, employed in renowned laboratories of our company and outside institutes, constantly develop and test our new products. As original designers, we offer the best value for your money. Pack of 2 packs of Aqua Kem Blue Sachets promo version. The package contains 15 bags. A very powerful and easy to use and dose toilet additive, indicated to achieve the best results for the waste tank of your cassette or portable toilet: easy to use: the bags dissolve completely in water. High concentration Removes unpleasant odours. Reduces gas formation. Keeps the drain tank fresh and clean. Suitable for camping in winter. Promotes the disintegration of organic waste and toilet paper, making emptying even easier. Average duration 4 or 5 days