The Elsan 25lt Blue 12% Drum.
For use with all chemical toilets, waste holding tanks & cassettes. Kills germs & prevents odours to keep toilets safe, clean & fresh.
Dosage - 60ml of Elsan Blue to the waste holding tank for every 10 Ltrs of waste tank capacity. Then add 2-3 Ltrs of water. British Standard Number - 2893:1989