Add 75ml to the waste holding tank for every 10 litres of waste tank capacity. Then add 2–3 litres of water. Always ensure that solid matter is covered, adding more water if necessary. More or less fluid may be required depending on the frequency of use and temperature.

For long term boat usage, increase fluid volume to achieve required performance. Empty the waste tank at a sewage disposal point. Elsan Blue will not harm seals or moving parts.