Elsan Blue Bags Cassette Toilet Sachets Pack of 18 + 3 Free SachetsKeep your toilet clean and fresh with these high quality waste water cleaning sachets from Elsan, the ultimate in chemical toilet sanitation and hygiene solutions for motorhomes, caravans, camping and boating.These Elsan Blue Bags are safe and easy to use. Each sachet contains a specific dose of concentrated powder, eliminating the need to do any measuring, helping you to keep clean and free from mess.To use, simply place a single sachet into the waste tank, then add 2 to 3 litres of water. The water soluble sachet will then dissolve, releasing the cleaning chemicals into the waste tank. This chemical helps to kill bacteria, and eliminates any unwanted odours. A single sachet will teat about 20 litres of waste.More sachets may be required depending on temperature and frequency of use. Elsan Blue Bags will not harm seals or moving parts.Specifications:Sachets: 21