My pond is not the biggest or the best in any way, With that siad, people always say “how is the water so clear with no UV filter” I would just show them my filter & how it works Come to find out my pond (700 Gal. with 3 large fish & 35-40 little one) is much more clear than others with filters that friends have piad 0-0 for You need your water to hit the carbon first(you can get a bucket of Premium activated carbon @ walmart much cheaper than the fish store) then it should go through 10-20 layers of fliter map( i used swamp cooler mats) final layer @ the bottom should be lava & or feather rock (i used both) adout 8″ @ bottom For your return go to a pipe store and get some BULKHEADS these will let you make a water tight seal any size WITH NO SEALENT( i used two 2″ return lines) Just the carbon alone will start to make the water smell better the first day but the boi part of the filter takes a few weeks to really clear the water up I hope this film helps some one save some money
