Coil-Flow 100 removes microbial contamination, dust, etc., from HVAC coils without disassembling packaged units or otherwise disturbing occupants of rooms involved. The self-contained cleaning system has a holding tank for cleaning fluid and its low water flow rate (0.4 gpm) eliminates water disposal issues (water simply goes down the HVAC unit drain). System comes with a variety of pressure washer wands and spray nozzles. Nalco Co.