Effortless is a soap solution that melts efflorescence and helps to control its return. The user does not normally have to use a pressure washer to get the job done. This product is mildly acidic and safe for virtually all surfaces it will encounter while being applied. Removal is a simple rinse off process. When after repeated applications, the Effortless stops foaming, the efflorescence is gone. The amount of coverage will vary with the thickness of the efflorescence, with the most common powder type probably getting 75 square feet to the gallon.