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Inflow: The inflow into the reductor can be realised as a bypass from the main circulation pump
with the included T pieces (10). The flow rate is adjusted by the valve (8) and the drop counter
(14).
6. Starting
Before starting, the Nitratereductor is filled with aquarium water and controlled for leaking and
the right position of the sealing. Take care for exact positioning of the O-ring. Close the 8 clamps
tightly. The internal circulation pump can be switched on.
Connection to an existing aquarium
If a Nitratereductor is connected to an existing aquarium with a rather high nitrate level, the
inflow of aquarium water should not immediately be started. The bacterial growth is enhanced by
the addition of 4 dosing spoons Denimar-Powder. If, after 8 - 10 days, the nitrite has
disappeared from the reductor - a residual concentration of nitrate is harmless - the water flow can
be switched on.
Connection to a new aquarium
If connected to a new aquarium, the bacteria do not have to be fed within the first 4 weeks, as the
nitrate forming bacteria Nitrosomonas and Nitrobacter need this time to develop and to oxydize the
whole amount of ammonia and nitrite into nitrate.
Feeding
The feeding has to be adjusted according to the nitrate loading of the aquarium. It can be
controlled with a redox probe (see options). In a normal loaded tank, one spoonful Denimar-
Powder per day is sufficient. It is possible to feed several dosing spoons (up to 5 pcs.) at one time.
The filter needs no feeding then for several days.
After some time, a slimy bacterial biomass is formed in the Nitratereductor. This a normal
process. A high bacteria population ensures a high removal rate of nitrate.
7. Feeding with Deniballs
AB Aqua Medic Deniballs are made of a biodegradable plastic material. This plastic material is also
produced biologically - the raw material is produced by bacteria. This new plastic material is
completely biodegradable. It can be used by denitrifying bacteria in the Nitratereductor to
remove nitrate. The Deniballs supply the surface area and the food for the bacteria at the same
time. This means that a Nitratereductor filled with Deniballs has not to be fed for a longer
period - up to one year. The quantity of Deniballs which are necessary for a Nitratereductor
depends on the loading of the tank. For a normal loading, 1,5 - 2 l are enough. The rest of the filter
is filled with the standard Bactoballs. The Deniballs need - especially in a seawater tank - a
longer period to reach their full capacity. During this time (6 - 8 weeks) the Nitratereductor has to
be feed with Denimar-Powder.
8. Maintenance
1. Control the flow rate: The flow rate through the filter has to be checked regularly. The optimum
is at approx. 1 to 1.5 l/hr. This has to be readjusted from time to time.
2. Recirculation pump: The recirculation pump has to be controlled regularly on clogging. The
pump housing has to be opened and the magnet with the needle wheel removed. Both are cleaned
under fresh water and mounted again.
3. Cleaning: If the bacterial biomass has increased after some years, the Bactoballs can be
removed, cleaned with aquarium water and filled in again.
4. Renewal of Deniballs: The Deniballs have to be refilled/replaced once per year.
5. Feeding with Denimar: Without Deniballs: 1 dosing spoon daily.
6. From time to time, measurement of nitrite and nitrate concentrations in the outlet of the
Nitratereductor.
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