Oberon46, I'm a bit curious about what you consider the yukky gunked up appearance is to you. Here is a picture of my pond/water garden. You can see the water is clear - see the shadows of the fish on the bottom? But the black liner is green now with a coating of algae. Is it the green color of the liner you don't like? Maybe you are talking about more of a string type algae?
The contraption on the bottom of the pond is now removed. That was unsightly but very functional. Its the pump and UV light attached to a repurposed plastic storage bin. I am going to replace the bulb and put it back into the pond in a less obvious place.
Do you have any pictures of your set up showing the stuff you think is unattractive? Thanks. Helen
