So I have this fish pond in my backyard...
It's got a hard plastic liner, and a waterfall thingie.
The water is really green from algae and the walls and floor of the pond have the green algae slime on them along with anything else that the water touches.
Do I have to clean this crap out by hand or can I put something in there to get rid of it? This pond's water supply is self-contained, I occasionally top it off with my garden hose. If I do have to clean it by hand, I want to know what I can treat the water with to prevent the buildup.
There are fish in it, but I can take them out if necessary.