Aqua Medic Nitratereductor NR 5000 Manuel d'utilisation - Page 3

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Fig. 2: Nitratereduktor 5000

2. Theory

Nitrate is coming into the aquarium via 2 different paths:

- with the tap water, with every water change or with the replacement of the evaporated water

- by biological reactions in the aquarium.

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

the 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:

The bacterium Nitrosomonas oxidises Ammonia to Nitrite, the bakterium Nitrobacter the

Nitrite to Nitrate.