I have a sheet of carpet-like green algae covering the bottom of my pool! It is disgusting with little bubbles. My water is CLEAR and one the sheets are lifted the bottom is clear. It is so strange! One pool guy I talked to said he's only seen it one other time in 31 years. I've been told the only thing I can do is slowly hand vacuum it up. What is the most cost and time efficient solution? I have a real mess on my hands. Thanks.