Description OLPRO OLChem and OLRinse Twin pack. OLChem is a great quality toilet chemical for breaking down waste in all portable and cassette toilets. Ideal for Caravans, Motorhomes, and Boats. It is also Formaldehyde Free . OLRinse toilet flush additive is great for cleaning all portable and cassette toilets. Ideal for caravans, Motorhomes and Boats. 2 x 2 Litre Bottles.   Specification OLChem Directions: For use in the waste tank of all portable toilets. Add 70ml of OLChem additive for every 10 litres of water. OLRinse Directions: For use in the flush tanks of all portable toilets. Add 70ml of OLRinse additive for every 10 litres of water.