An Easy to Build Nitrate Filter:
|I have been asked many times on how to get
rid of the build-up of Nitrates in a Koi pond, especially one
that is built indoors..... My Good Friend Peter Waddington
told me basically what was required and told me what materials
I should use to contruct such a Nitrate filter. That was quite
a few years ago many years ago and I having built one and
installed it on one of my own systems, which has a volume of
8,600 gallons, I found that although it was very slow to start
to make any difference to the readings which we normally had -
that after about 3 months is did start to reduce the Nitrate
levels in the tank ....
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
See the New Cartridge Filter for finely filtering and polishing your water
Please contact us if we can help in any