If youre heading out into the bush with a mobile toilet, you need toilet additives to keep it sanitary and reduce odours. Out of your options, this Thetford Aqua Kem Green Toilet Additive breaks down waste biologically, making it more environmentally friendly than other products. It lasts between three to four days, and reduces unpleasant smells and gas build up. Safe for use in septic tanks. The dosage for the Aqua Kem Green Sachets is 75mL per 10 Litre holding tank capacity. Just add 2 to 3 litres of fresh water.