Thetford Aqua Kem is a low-cost, easy-to-use toilet fluid with biological activity for waste holding tanks, providing the greatest performance for your cassette and portable toilets. Simply dilute this easy-to-use chemical with 2-3 litres of fresh water for every 10 litre holding tank capacity. This solution will last 4 to 5 days before it needs to be refilled, minimising odours, gas production, and assisting in the liquefaction of solid waste for easy emptying and cleaning.