The best way to knock it down, is filtration, and for a pool that size and lack of depth, it would be a small wave pool π€£
Water fowl, birds, and heat....
Yβall, not to be a huge nerd but for the reflecting pool you would need a minimum of about 8,000 liters of 12% hydrogen peroxide to reach the 50 parts per million concentration to kill algaeβ¦
Is this what happens when you have 0 scientists in your administration?