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Pond BioFilter!
By adding lava rock, foam, shaved PVC or gravel to a box-style mechanical filter creates a biological filter. It is not used to remove pond debris or algae, as it is only designed to dissolve an organic waste. As the pond water moves through the added elements, which now harbor nitrifying bacteria, this newly created biological filter speeds up the process of converting ammonia to harmless nitrate. One point to remember is that it must be in operation 24 x 365 or bacteria dies. Every couple months I take mine completely apart for cleaning. Since the water flow stops, the oxygen supply stops. Bacteria cannot survive without the oxygen. I am positive that when it is assembled and water flow is restarted, there arent any bacteria in it. If I let it re-establish itself naturally, it would take as much as three to four months. The solution to that is to jump-start it. I use a BioFilter Booster to get everything back to normal in one to two weeks. Visit our Waterfall Tanks Store!!!! We are proud to offer the best quality and functionality tanks for pond waterfall. I am sure by now you are wondering what it takes to make the pond biofilter. Well, here is how I build mine! First and foremost biological filter had to be as simple as possible, easy to clean and be large enough to accommodate water flow rate up to 3,000 GPH. The unit I chose for the filter housing is an absolute essence of simplicity. The filter housing measured 28 wide x 52 long x 24 tall and has a 3 lip at the top. The total capacity is 100 gallons and it is rated at 1,800 GPH. By adding three additional outlets I was able to achieve a flow rate up to 3,500 GPH.
Next, I purchased three milk crates, laundry mesh bags from a laundry supply store and lava rocks. The empty milk crates went to the bottom of the housing. I filled laundry bags with lava rocks and placed them into the milk crates. I also purchased two full sheets 4 x 5 of 2 thick reticulated ether based foam and trim it to fit it tight into the filter housing. The foam sheets stacked on top of the milk crates provide very good block to any size particles. The filter housing comes with a Filter Grate, which I placed on top of the foam sheets and weigh it down with a few flat stones. 
To complete my pond biofilter, I planted Variegated Water Celery on top of it.My pond biofilter was complete. 
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