Qualkem Box of 10 x 1 Litre 40 Shot ECO GREEN Cassette Fluid. A unique environmentally safe cassette toilet fluid developed to be Biocide free, Enzymatic free & Probiotic free, making this the first on the market to make this claim. We have also removed the dye and given it a fresh floral fragrance all from a 20ml dose in the waste and 5ml in the flush. PLease Note. 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.