Velda GIANT BIOFILL XL Mode D'emploi page 17

ITEMS FOR SPECIAL ATTENTION
If water should leak from the top of the Giant Biofill XL , this can be caused by pressure building up
inside the filter, as a result of which the water can not flow freely. Below you find some items which
will help you finding out why the filter is leaking:
l Place the filter above the level of the pond water and horizontally on a flat soil.
l The filter materials should have been place in accordance with the instructions for use.
l Inspect whether the filter material is blocked up or polluted. Especially if the pond water was /
is considerably green, the filter material can quickly get polluted and it has to be rinsed then.
l The outflow orifice of the filter (75 mm) may not be reduced. The water must be able to flow
out freely.
l The maximum flow capacity of the filter is 15,000 l/h. If the net output of the pump is larger, the
water will flow over the edge.
l Avoid back pressure. The water may not be elevated after the filter.
l To prevent any leaking of the sliding valve it is recommended to place back the cap on the
draining opening after rinsing the filter.
As Velda can not exercise any influence on a proper installation as well as the functioning of the filter
on the spot, Velda can not be held liable for any leakage, as a result of which the pond will loose water.
MORE INFO
Clean water is the basis for the biological balance in the garden pond. The most important factor for
a healthy pond environment is the water, since its composition directly influences the growth of the
water plants, the development of micro-organisms, and the condition of the fish. The water must
then also contain all the elements that are necessary for the biological and chemical processes in
the environment. If all the values are good and the micro-life function well, then there is a biological
balance. A filter installation is a solution for many ponds because often, too many fish are kept in
relation to the volume of the pond water. In a garden pond, fish have much less water at their
disposal than in nature, while the natural balance is also quickly affected because the fish produce
a lot of waste. This is definitely the case when keeping Koi-carp. The water can be kept clearer
through filtration, and the water circulation ensures enough oxygen. The Giant Biofill XL can be
used mechanically as well as biologically to filter water. A short description of both methods follows.
Mechanical working
The working of a mechanical filter is based on removing organic and inorganic waste particles and
possibly - depending on the filter material - removing colour particles. To prevent the filter material
from becoming silted up, it should be regularly rinsed clean. This normally tedious task is as easy
as rinsing the cassettes with filter materials with tap water.
Biological working
The basis of a biological working filter is to obtain a better and quicker conversion of organic
elements through the use of micro-organisms. A biological filter promotes the general activity of
micro-organisms and by doing so, stimulates the growth of water plants. Use of biological filtration
is recommended when there is stagnant plant growth and/or extreme algae growth. Initially, the
filtration will be exclusively mechanical, but over the course of time, the material becomes
biologically active. The biological working of the filter is stimulated by the inoculation of the filter
material with a special bacterial culture, such as Bacterial Filterstart.
CONTENTS
1. Cassette: UV-C Unit (18 Watt), aeration and heating (optional)
2. Cassette: bio balls