this was bought to replace a much more expensive Karcher jet wash which failed just outside its manufacturer's warranty period. I would not buy another Karcher, as their window cleaner did exactly the same twice! I did much research before purchasing this product which paid dividends. this successfully cleaned a large patio area which took 1.5 days but the end result is startling. Painfully slow but that well worth it. Excellent product and much superior to many more costly equivalents.