An Easy to Build Nitrate Filter:

I now have the greatest pleasure of passing that information on to our web site visitors and hope that what I can now suggest works for your own system ... There is no doubt in my own mind that these Nitrate filters work and do reduce the levels of Nitrate within the system.

The main body of the Nitrate Filter is made out of 9" underground waste pipe and has a perforated media support tray which I had plastic welded into place about 6" up from the bottom. Also welded in were the two connections - the inlet which is at the bottom in 1.5" and the outlet in 1/2" which is at the top just above the water level.

Once those welds were made then we had a good strong piece of PVC 1/4" plate welded onto the bottom to act as both a stand and to retain the water in the chamber.

The water is transferred, in our own case from the last biological vortex in the line of 5 back to the first biological vortex via a 1/2" pvc pipe and the pump we used was a 25gph aquarium pump.

The pumping rate should be kept as slow as possible - this allows plenty of dwell time in the filter chamber which is filled with Siporax and Bioholme (sintered glass media) but I am now wondering if using the new Kaldnes (K1) from Evolution Aqua, whether this may do the job equally as well and of course at a much lesser cost than the sintered glass which is quite an expensive media and is also quite hard to obtain these days ..

Finally, I wish you all the best of luck if you fancy having a go at making one of these simple Nitrate filters ..