Blue Diamond’s “1L Uno Chem” toilet chemical is a unique ‘all-in-one’ solution which merges our best-selling bowl and toilet cleaners to create the ultimate formula that can be used on both the top and bottom compartments of the toilet. Biodegradable and fully formaldehyde-free; this concentrated chemical is highly effective in hard-water areas. The chemical has integrated limescale prevention and a unique measuring system that guarantees to deliver at least 40 doses. The long-lasting pH neutral formula and strong medicated fragrance makes this product especially formulated for use in camping, caravan, motorhome or marine cassette toilets.