Water from the pond enters the nexus via the inlet into the inner chamber which works as a vortex allowing larger solids to settle out.
Water then passes through the grills in the stainless steel Eazy filter, where the finer particles are removed at the mechanical stage of filtration, thanks to the static bed of our award-winning K1 Micro filter media.
The mechanically clean water then passes to the outside chamber of the nexus where the K1 Media moving bed is located for biological treatment prior to being returned to the pond.
At this stage, biological breakdown occurs through different strains of bacteria and filter feeders living on the protected surface area of each piece of the K1 Media. These bacteria convert Ammonia and Nitrite into harmless Nitrate.
Water then passes through the exit grill into the outlet, returning back to the pond.
The Eazy Filter: The Eazy is a stainless steel vessel containing a set volume of K1 Micro Media (20 litres in the Nexus 320 and 18 litres in the 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 take place and fine particles are caught within the K1 Micro. The water then flows through the slots in the center column and into the outer chamber.
Biological Filtration - K1 Moving Bed: The outer chamber of the Nexus contains the moving bed of K1 Media. 100 itres of K1 Media is supplied with the Nexus 320 with the option to add an extra 200 litres of K1 Media should it be needed. The Nexus 220 is supplied with 50 litres of K1 Media, with the option to add an extra 100 litres of K1 Media if needed. This allows the biological capability of your filter to grow with your fish.
The outer chamber 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 dependent on feed rates and the type of food used. For higher feed rates additional K1 Media should be added into the outer chamber.
Air Pump Requirements: You can increase the biological capacity of your Nexus by adding additional K1 Media into the outer chamber. You will, however, need to ensure that you have the correct size of air pump to enable the K1 Media to move sufficiently (see table for recommended size of air pump).
For Nexus filtration systems straight out of the box with no additional media added, we recommend an Air Pump 75 to power the moving bed in a Nexus 220 and an Air Pump 95 for a Nexus 320.
Nexus filtration systems can be installed on PUMP FED or GRAVITY FED set-ups. In all circumstances, the Nexus MUST be installed on a solid, level base, a minimum of 1.2 metres x 1 metre.
View Nexus EAZY 320 Installation instructions here (PDF)
View Nexus EAZY Gravity-Fed Cleaning Instructions here (PDF)
View Nexus EAZY Pump-Fed Cleaning Instructions here (PDF)