7
HOW THE NEXUS 220 WORKS
The Eazy (Mechanical Filtration)
The Eazy is a stainless steel vessel containing a
set volume of static K1 Micro Media (18 litres
for Nexus 220) which is located within the inner
chamber of the Nexus. After water enters the
Nexus it rotates around the Eazy in the inner
chamber with a downward motion allowing the
larger solids to settle to the bottom of the chamber
before passing through the slots of the Eazy into
the static K1 Micro. The water flows from all
angles through the K1 Micro where improved
mechanical filtration and settlement takes place
and fine particles are caught within the K1 Micro.
The water then flows through the slots in the
centre column and into the outer chamber.
The Eazy has been designed so that it can be
easily lifted out of the Nexus should it be needed.
Outer Chamber (Biological Filtration)
The outer chamber of the Nexus contains the moving bed of K1 Media. This is where the
final stage of biological treatment occurs. Biological breakdown occurs through different
strains of bacteria living on the protected surface area on each piece of the K1 Media.
These bacteria convert Ammonia and Nitrite into harmless Nitrate. The amount of Ammonia
and Nitrite produced in the pond is dependant on feed rates and the type of food used.
For higher feed rates additional K1 Media should be added into the outer chamber.
In optimum conditions 250g per day of average protein content food will be broken down
by 50 litres of K1 Media. To ensure excellent biological filtration of a Nexus maintain a
pond pH of 7 or higher. Bacteria conversion rates are reduced in cooler temperatures.
Figure 3. Illustration shows improved water flow
through the Eazy.
