The Thetford range of products is known around the world and recognized as the No.1 for toilet additives. The Aqua Kem Blue sachets are the best pre-measured, water soluble toilet sachets worldwide. The sachet provides the right dose every time, with the concentrated powder liquefying solids in the waste holding tank. They also help to keep the tank smelling fresh, and reduce gas build up. Refresh every 4 to 5 days. Established in 1971, Thetford have had a passion for camping and travelling, no matter whether by caravan or motorhome, camping in tents or enjoying a leisurely holiday on a boat. They have been preaching and guaranteeing carefree holidays now for more than 40 years and are recognized as the world market leader in mobile sanitary systems, refrigerators, cooking equipment and toilet additives.