Looks like a great site with lots of info. This is my 4th year with my 8'x12' watergarden. The first 2 years used lava rock in my bio filter (biofalls) and these worked really well. Not so good the 3rd year. Last year, I tried the Spring coil with bioballs. Still no clear water. This year I picked up some scrubbies from Skippy. I put in Microbe-Lift spring clean up and Microbe-Lift PL. Pond is very green and not a bit clear. Do I rinse my bio filter? It is full of green sludge. Also, I keep reading lots of differing views on aerators. Would installing one help? I appreciate any insights.