What do you know about the pond? A few questions that come to mind. Does this pond receive fertilizer runoff? Does the pond have a septic function? I see the float-ring, but was this pond previously used for swimming? Do you want the water to be clean enough to swim in?
I'm not certain, but the red color suggests this is a Euglena sp. Euglena is a protist that can both photosynthesize like algae and also directly consume other micro-organisms.
I know there are many chemical and bio-cultural products available, but wading through the pros and cons of each is an involved task (pun intended).
A 'natural' fix for the pond would include adding native plants and fish. This could be best started at the end of Winter before the algae levels rise. Especailly useful would be submerged plants that can displace and compete with algae.