After two years the algae are back in the pond.
The green colors are beautiful but the overall look is definitely worse and you can’t see the fish. I checked the UV filter bulb and it was still working. However Steve at PTF told me that the bulb can be glowing but not “UVing” (the verb form of UV). I ordered a new bulb and we shall see.
For now we will enjoy the luminescent greens.
Turn it into biofuel. In fact, maybe you can use it to power the contraptions for the pond itself!