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In the photo to the right you can see a clearer
view of the two chambers, complete with Answer 410, which of course
are 'interlinked' to provide both mechanical and
 biological
filtration on up to a 7,500 gallon pond.
The K1 (Kaldnes) media here can be seen to have changed colour ..
this is normal when a system is kicking in and is working well ..
note the K1 is kept totally separate to the inner chamber, which in
this case houses The Answer, which is the mechanical stage of the
filtration ... the water passes through to the K1, via the Answer if
fitted, where it then passes through the biological stage of the
system prior to its return to the pond ....
From this view of the 'NeXus' you can see the entry in from the
pond, which can be either Pump or Gravity fed, and also the return
pipe which in this case, as this is a gravity fed system, is going
to the pump which will then pump the water back to the pond, via a
UV and possibly a heater if one was fitted ...
Full Manual on
the NeXus EAZY Systems in PDF Format
 How it works:
The EAZY is a stainless steel vessel
containing a volume of static K1 media which is
 located
within the centre chamber of the NeXus.
Water enters the centre chamber and then enters
the Eazy via slots in the lower half of the unit. This
results in a downward flow causing many of the larger solids to
settle out prior to entering the Eazy. the size of the slots
will not allow large mechanical waste to enter the cylinder this
acting as a first stage mechanical filtration.
The water then passes through the static K1 media
utilising up and side flow and this process causes the fine solids
to become entrapped.
The mechanically clean water then passes to the
outside chamber of the NeXus where the Kaldnes moving bed is located
for biological treatment prior to being returned to the pond.
Manual on
Installation and Retro Fitting of the EAZY System
MAINTENANCE
The NeXus Eazy is extremely 'eazy'
and pleasurable to clean. The water pump is switched off and an air
valve is operated which diverts air from the main NeXus air ring in
the outer Kaldnes chamber, into the base of the Eazy. This
causes the K1 media to be agitated and cleaned vigorously. As this
happens the captured particles are flushed out into the central
chamber of the NeXus allowing you to see the amount of waste that
has been filtered out. Once the K1 media as been agitated for a
sufficient period, the water in the central chamber is flushed to
waste using the purge valve provided at the base of the NeXus. Once
clean, the air flow is redirected back to the main air ring and the
system can be started again. The whole process from start to finish
can take less than two minutes. No high pressure pumps are required
or needed unlike pressurised systems, there are no running costs and
the media can be visually checked that it is 100% clean, unlike
closed systems its simple to clean, 'eazy' to do and actually
enjoyable .. | 
You
can also see the 2 Drain off valves both fitted in this case with Ball
Valves (the photo left shows how these two ball valves (one from the
Central Chamber and one from the Kaldnes chamber) which come as part
of the standard equipment. 
Kaldnes K1 has been proven in fish farming with feed rates up to 1.5kgs of 40 protein food per 100 litres of media per day. Evolution Aqua is rating it at a maximum of 0.5kgs of food per 100 litres used in order to ensure the best possible water parameters are achieved. If a higher feed rate is required, extra media can easily be added. 