Biotec 12, 18 and Biotec 36
12, 18 and 36 OASE have once again set new standards for filter
implementation in garden ponds. Simple operation, fast, clean
maintenance, and an outstanding filtration result are the unique
features of the new Biotec filters.
A specially designed sieve, the “Screenex”, retains all debris
particles up to a size of 100 micron, which are pumped into the
filter. After the water flows back through a special mat where it is
enriched with oxygen, it falls into the chamber below, flows through
the filter zones, and then reaches the next filter chamber
The nitrosomonas and nitro bacter bacteria present in the pond water
settle and multiply in the oxygen rich filter zones (blue sponges)
and in the oxygen poorer zones (red sponges and individual chamber).
In various biological processes they convert toxic ammonium/ammonia
via nitrite to nitrate and finally to gaseous nitrogen. The
individual chamber situated just in front of the outlet, is called
“individual” because every consumer has the choice, which filter
material to insert (i.e. OASE Phosless). The chamber is equipped as
standard with Zeolite.
Long service life
With the Screenex filter process happening prior to the actual
filtration, so many coarse particles are removed from circulation
that only lightly polluted water actually reaches the filter
sponges. This makes a longer than average cleaning interval
- The new flow through filters Biotec 12, 18 and 36 are
particularly characterized by the newly developed,
patent-applied-for, “Screenex” system, which eliminates coarse
pollutants up to 100µ (0.1mm) from circulation before they reach
the filter foams.
- A flow regulator situated just above the water distributor
allows the manual adjustment of the flow rate as well as the flow
speed of the water reaching the Screenex.
- Retained dirt particles can be washed off the Screenex by
opening the flow regulator shortly. Dirty water can escape through
the drain next to the Screenex.
Screenex can be folded upwards at a 90° angle to allow free access
to the filter foams.
- An electronic indicator shows if cleaning is required.
- It is no longer necessary to remove the filter foams from the
filter for cleaning. The special tool, supplied with the filter,
allows the sponges to be cleaned directly in the filter.
18 is equipped with a 50 mm sludge drain. The drain can be opened
by moving a slide on the inside of the filter.
- The new Biotec filters have a so-called individual chamber,
which is filled as standard with Zeolite. However, as the name
indicates, the use of other filter media such as OASE Phosless is
- The filter can be recessed into the ground up to 2/3 of its
height to integrate it nicely into the landscape surrounding the
- Biotec 36 is equipped with a relatively larger Screenex and a
sludge drain which can opened via an internal slide.