Today I changed the water in the pond. It started out with about 11" of water, I need to take out about 15% of the water according to the instructions. I ended up draining to about 8" instead, then filling back up to about 11.5". I also put in some clarifier this time only about 50ml as the bottle instucted about half the normal, so I rounded down. Water is more or less clear, the bottoms does seem to have a coating of green. The upper pool, has some redish/orange I think algae growing. But looks like only a coating. There is also some green algae on the upper one as well, but the same as the lower pool.