Elsan Blue and Rinse 2 x 2 Litres Promo Pack.
Anti-bacterial formula kills germs & odours. Non-staining & suitable for all makes of chemical & cassette toilet. Double concentrate is better value because it lasts longer. Dosage: Add 30ml of Elsan Double Blue/Rinse to the waste holding tank/fresh water tank for every 10Ltrs waste tank capacity/fresh water.