Qualkem Box of 10 x 1 Litre 40 Shot BLUE Cassette Toilet Fluid. A high quality Formaldehyde free Cassette Toilet Fluid which is both flush and waste fluid in one, with a long-lasting cherry fragrance and easy wipe dye, formulated to use 20ml in the waste and 5ml in the flush. *ALL FLUIDS ARE MINIMUM ORDER 3 BOXES (MIXED). DISPATCHED DIRECT FROM MANUFACTURER. DOES NOT CONTRIBUTE TOWARDS YOUR PLS CARRIAGE PAID ORDERS. PLS PLACES ORDERS ON WEDNESDAYS FOR DELIVERY THURSDAY/FRIDAY DIRECT FROM MANUFACTURER.*