I have a few ?'s to ask. Would anyone by chance have a Bio-filter that you might be interested in selling for a good price? I am starting a water pond and I am doing a small 3 1/2 ft oval pond on top of a small hill that I have in my yard. It'll only be about 18"deep at the most, there on the top, and then it will pour over into the waterfall that I plan on building in the hill by making steps in our hard Ga red Clay and then putting bricks on it to hold it in place and covering the bricks w/something soft not to tear the liner. Then at the bottom, I want a 8' x 6-7 ft odd shaped pond w/ Koi on one side and seperated by a net with plants on the other side. I plan on in the very center having it 22" deep and about 16-18 inches on the side with koi, which they will have access to the deepest part in the center. Then on the other side where the plants will be I want it to be different depths for aquatic plants. Maybe 12" in places and 14-16" in other places. I am also wondering if anyone could answer a few ?'s. If I have a regular filter, can I make it a bio-filter by adding carbon inside the filter in a cheesecloth or is there any other way to make a regular filter a bio-filter? Any advise would be greatly appreciated. I have also been told that you can use peat moss to filter w/too. Could someone please help me out with this. The bottom will be made from a 12' pool liner and I also have a regular pool pump that went to that. I plan to start as soon as possible so any help would be appreciated soooooooooo much!! You guys are so great, and I trust your advice. And if anyone has a spare filter or pump, please LMK and I'd be so greatful!!