When I am not the fall of water in my Koi pond, the rocks are bleached. Why is that?
I run the waterfall once a day for several hours. I live in Texas Therefore, during the day of his nearly 90 degrees outside. The Koi pond is made of stone and mortar and have some filamentous algae.
When the waterfall is running and algae growing on rocks. When you clear the waterfall dry and bleached in the sun. You will often see the same effect on a river where the water level falls in the summer. Ian
Waterfall Koi
