Hey Rey I recently put a pond together for my aunt. We just bought her one of those green Tetra Pond Filters (has a barrel shape to it and has a screw on lid). When summer hit the pond was super green with floating algea. I replace the media inside with lava rock from Home Depot and added a chemical to the water to make the algea bind together and BAM! Crystal clear results. My mom did the same thing and the lava rock did the trick. Hope this helps.