Removing Decorative Concrete Stain - PartI

I had the patio stained a color that looked good with my fence and house colors. Two years later, though, the stain is flaking off and algae has grown over about a third of the surface. It's time for the stain to be restored! I'll start by pressure washing off as much of the stain as I can. https://youtu.be/efsOjS7qOPo