when i get that far i probly take pics. havent decided on wether or not to use a plastic sheet dubled over for the liner. Or go with the firestone roofing rubber. If i can get the roofing rubber ima use it cuz i should be able to get it for free. I use to do roofing. Filters im thinking of useing a small kiddiepool filter. But have the kiddie filter intake hose run to a piece of pvc pipewith bunch of holes drilled in it. To help cut down on the suction of it. Then have it pump the oulet into a 50 gal trashcan filled with lava rocks. And use 4 to 8 inchs of sponge on top the rocks then have it gravity feed back into the pond.