Been batteling green water all summer. My 2 little pressuized filters werent getting the job done. I fianlly got my DOC bio filter made and a 55 watt UV sterlizer installed. within 5 days, I can see the bottm now. 4.5 feet deep. Still a hint of green in the water, but it appears to be getting better day by day. took a pic with my iphone, but I cant get it to attach... thanks everyone for all your help. I think the EPIC battle vs green algae water has finally been won!!!