Aqua Medic SN 400 Mode D'emploi page 10

- Overfertilization/Eutrophication: The aquarium is overfertilized, the algae growth increases and
cannot be controlled anymore.
- Toxic effects to the animals: Many invertebrate animals in sea water tanks are very sensitive to
higher nitrate levels.
3. Description of the Sulphur-Nitratereductor
The Aqua Medic Sulphur-Nitratereductor consists of a reaction vessel (1) of 2.3 l volume. To
provide surface material for the bacteria, the filter is filled with Sulphur Beads and Hydrocarbonate.
They create an ideal microclimate for denitrification.
To avoid dead zones, the water is recirculated internally in the Sulphur-Nitratereductor. A re-
circulation pump is placed in the top.
Connections:
The following connections are located at the Sulphur-Nitratereductor:
- Inlet (5): Here, you can connect a 6 mm air tube. At the inflow, you find an adjustion valve to
adjust the flow rate. The best value is approx. 0.5 - 1 l/hr (approx. 1 drop per second). The
adjustion at the inflow causes a delay until you can read the adjusted drop number at the drop
counter at the water outlet. The drop counter is mounted inside the aquarium, close to water
level. If the flow rate is regulated in the outlet, the valve may not be closed completely in order
to allow produced nitrogen to escape. During the start phase in the first weeks, the outlet valve
should stay completely open.
- Redox electrode (3): Through this opening, you can put a special pressure-resistant ORP
electrode with a special length and standard thread (PG 13,5). Aqua Medic order-No: 220.19.
- Outflow to aquarium (7): Here, you can connect a tube 8/6 mm.
4. Set-Up
The Sulphur-Nitratereductor is a hermetically closed system. The produced gas (nitrogen and CO
can escape through the water outlet. For this reason, the outlet should never be completely closed
because an eventual overpressure may escape through the water inlet and interrupt the inflow.
The Sulphur-Nitratereductor has to be placed in a way that water can flow off either directly back
into the aquarium or filtration chamber. In a seawater aquarium it is advantageous, if the
outflowing water is flowing into the inlet of the protein skimmer or the trickling filter. In the protein
skimmer, the water is saturated with oxygen before it comes back into the aquarium.
- Inflow: The inflow into the reductor can be realized as a bypass from the main circulation
pump by the included T-pieces (8). In case of a Percula aquarium, the reactor has to be placed
in the chamber behind the trickle filter. There is a special adaptor available (order-No. 503.00-
17 - not included) for connecting one of the pumps to the water current. Put adaptor on the
pump's pressure side and stick it through the hole of the filter chamber.The flow rate is
adjusted with valve and drop counter.
5. Starting
Before starting, the Sulphur-Nitratereductor is filled with aquarium water and controlled for leaking
and the right position of the sealing. Close both clamps tightly. The internal circulation pump can be
switched on.
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