After each use, inspect the rectangular filter screen located in the fill opening of the solution (lower) tank. If debris is present, remove screws that hold the filter in place and remove filter from the solution tank opening. Clean filter by holding it under a water faucet and letting the water run through the filter in the opposite direction from the normal filling flow. Replace the filter screen and fasten it in place with the two mounting screws. Not available for shipment to Alaska, Hawaii, or Canada.