Qualkem Box of 10 x 1 Litre 40 Shot RV Toilet Fluid. A dedicated highly concentrated Formaldehyde free holding tank formula for macerator & marine toilets used on Motorhomes, RVs, Boats, Barges and Marine Vessels. This long-lasting fluid is designed for 25ml to treat waste for up to 14 days. 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.