The top of my waterfall is a huge black tub and it is buried in the ground, and rocks placed around the edges. Inside the tub is water lettuce, hyacinths, and a papyrus to filter the water and I would say 90% of the time it does a great job. The few times it doesn't, really HOT and dry outside. I slit open a pillow and let the water from the waterfall run thru the fibers, once cleaned up, I pitch the pillow. Now it is not the most beautiful look while it is working but doesn't take long and works for me.
