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be2adn.DOC, Seite 9 von 9, Aug. 11
(10h.) for the flushing process: the automatically
driven ball valve is opening. If it is fully opened
switch off the main switch to zero.
Not before the filter is filled up completely
with water you may start up the unit. Throttle the
ball valves (4.) to 45° and close ball valve (5.).
Switch on the motor protection circuit-breaker
(10b.), close the cover of the electric box (10) and
switch on the main switch (10a.): the main pump
is starting.
7.2. Adjusting the water flows
Open the ball valve (4.) for filtering mode in that
way that the sulphur granules are just not moving.
The water flow for the filtering mode can be seen
at the flow meter (3.). The flow should corre-
spond with the numbers in the above table. Be-
cause of the specific weight with sea water the
values are a little bit lower. The inlet water flow
affect the water flow, too.
ADN size
400 600 1000 1500
circulation water
flow in m
3
/h
10 22 53 130
The water flow for automatically flushing can be
adjusted only if the flushing process is active.
Therefore push the pushbutton (10h.). If the
automatically driven valve is opened totally you
can open the ball valve (5.) carefully. The sulphur
granules may move a little bit. But do not open
the valve too far so that the granules are pressed
against the upper strainer (1b.).
The flushing volume of manually driven ADN-
filters is individually adjusted at each flushing
process with ball valve (5.).
If the filter granules are covered with bacteria
you must correct the water flows.
7.3. Adjusting the times for
flushing and interval (only
model “-a”)
You can adjust the times for flushing and inter-
val: the timer (10d.) is for the flushing time and
the timer (10c) of the interval.
Take care that the time for interval is never
below 1 minute. Otherwise the automatically
driven ball valve can collapse.
Adjust the times in the start up phase to 1 hour
for the interval and to 1 minute for the flushing
time.
In biological stable filter the times may corrected:
a lower interval time and a longer flushing time
depending on the structure of the granules.
7.4. Adjusting the feed flow dur-
ing the starting phase
To adjust the feed flow use the ball valve (7.) and
read the water flow meter (9.).
Start the ADN-filter with the lowest water flow
shown at the flow meter (see below table).
ADN size
400 600 1000 1500
feed water flow
in l/h
100 250 600 1500
During the start up phase measure the nitrate con-
centration in the ADN-filter every week, please.
You can take water sample at the sample valve
(E.).
If the nitrate concentration trends towards zero
double the feed water flow. During the start up
time nitrite can accrue. These concentrations are
not dangerous because on the one hand the feed
flow (outlet flow) of the ADN-filter is only a
small part in the allover conventional filter flow
volume and on the other hand the nitrite will be
oxidizes very fast by the bio-filter or ozone
driven skimmers.
The start up time takes 1 to 10 weeks,
sometime longer. This time depends on the fact if
the specializes sulphur oxidizing bacteria are
available in the aquarium water or not. To accel-
erate the process it is possible to inoculate bacte-
ria of an already running ADN-filter. Put the bac-
teria covered old granules into the new filter.
Bacteria grown in conventional driven de-
nitrifying filter are not suitable for the ADN.
Conventional filters are fed with organic source
like alcohol, organic acids, sugar, PHB.
Another parameter for estimating the efficiency
of the filter is the ORP. To measure it the AND-
