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Fig. 2: Nitratereductor 400 beside a filter tank or an aquarium:
4. Y-piece (connection for feeding syringe and water)
5. Adjustion valve for waterflow
6. 6/4 mm tube (feeding and water inlet)
7. 8/6 mm tube (water outlet to drip counter)
8. T-piece for bypass
9. Pressure side of circulation pump
10. Filter tank or aquarium
11. Circulation pump
12./13. Power plug
1. Product description
The AB Aqua Medic Nitratereductor consists of the reaction vessel (height = 37 cm, volume approx.
2.3 l).
The reaction vessel is filled with AB Aqua Medic Deniballs. In the top of the filter, the water outlet
is placed. Beside the top, you find the water inlet and the port for the pressure resistent mV
electrode (thread PG13,5). For the Nitratereductor 400, a special probe which is shorter in length is
available (220.14).
One tube with Denimar tablets to feed bacteria is included.
2. Theory
Nitrate is coming into the aquarium via 2 different ways:
with tap water, with every water change or with the replacement of evaporated water
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by biological reactions in the aquarium
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These biological reactions are responsible for the farmost biggest part of the increase of the nitrate
level.
How is nitrate produced in the aquarium?
When the animals are fed with dried, living or frozen food, proteinaceous substances get into the
aquarium. These are the basics of the diet for the animals. A big part of the nitrogen from food is
however excreted into the water. This nitrogen is metabolised by bacteria, living in the aerobic
filter via the toxic intermediate substances ammonium and nitrite to the less toxic nitrate. These
biolochemical reactions take place in the presence of oxygen:
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