- Country of manufactureMalaysia
Deliwater 7 Hole Ultra Filtration membrane
Principle of Filtration
The ber for the application in water technology is a Dutch invention of Dr. Koenhen about 25 years ago and found its way as “Singlebore”
and “MultiBore” or “SevenBore” in the world markets.
PVC ber material is from Bayer AG and the spinning head to produce either of the above mentioned product names is Koenhen’s
The SevenBore membrane has been developed by Dr. Dick Koenhen who has already successfully developed the X Flow membrane
(singlebore) in the past. One of the major disadvantages of the singlebore membranes is the low strength of the membrane ber. The
ber needs careful treatment in operation to avoid too much stress, to minimize the risk that the ber would break and ltration
would fail. With the SevenBore above is not applicable as the membrane is 20 times stronger than a singlebore.
A stronger ber will enable the operator or design engineer to use a more robust cleaning method with backwash and forward ush.
Even a limited backwash pulse is possible. The strength of the ber is an important benet to use this membrane in small scale, stand
alone ltration units. It has delivered membrane elements for at least 300 installations in Europe for drinking water ltration point of
entry/use already (replacement of singlebore bers)
The ber got extra strength from the 7 capillaries which are in one ber. It has developed a special mixture of polymers and production
method to realize an open foam structure (see picture). This open structure gives the permeate water moving through the ber,
hardly any resistance. In a standard extrusion process the outside ber surface is normally closed due to the inherent production
With some added chemicals It has put extra hydroxide groups into the ber material which are realizing a more hydrophilic surface
which is benetting the water ltration. Many membrane producers are doing this with PVP, but PVP will be slowly washed out of the
membrane and the hydrophilicity and lifetime of the membrane will be reduced.
All UF lters carry a quality sticker from the Hygiene-Institut des Ruhrgebietes in Germany. In fact it is the only lter in the world which
has such a quality approval for a lter which has been tested for the Legionella bacteria. The UF lter has been developed after the
rst outbreak of the Legionella bacteria decennia ago in Holland (scan 0001 and gepruefte Qualitaet).
We are not only a supplier of UF lters but also of complete water treatment plants of any capacity and any water from sweet to
brackish to sea water built from foreign and/or local components. We also provide installation and regular maintenance for installed
units if so required through our associates.
The operation of the 7 holes UF lter is based on the principal of Ultraltration. The 7 holes UF lter system is a fully automatically
self-cleaning system. The lter elements consists of a great number of hollow membranes with a pore size of 0.01μm. Compared with
a human hair the pores in the membrane wall are approximately 1600 times smaller. The active lter layer of the membrane is on the
inside of the capillary. The water is pushed through the 0.01μm pores in the wall from the inside to the outside of the membrane
whilst removing suspended solids, particles, viruses and bacteria like the Legionella bacterium out of the water. The remaining
particles on the inside of the membrane will be removed from the membrane wall via an automatic forward ush procedure
controlled by a PLC or timer and ushed to drain. This self-cleaning process makes use of the water pressure from the supply source.
The cleaning frequency and cleaning times are adjustable.
The 7 holes UF lter unit is especially designed to built-in directly in the water line behind the water meter. The unit consists of two
Ultraltration elements and will be delivered “Ready for Use”.
The system will be delivered including:
• 7 holes Ultrafiltration elements
• 304 Stainless Steel piping
• Water by pass valve
• Supporting framework
• 304 Stainless casing
Functions of the elements:
The 7 holes Ultralter element
Removes all water related pathogene germs and bacteria like:
• Legionella Pneumophila
• Legionella spp.
• Escherichia coli (E-coli)
• Pseudomonas aeruginosa
• Amoeba associated bacteria
• Vibrio cholera
Please Call +6012-3790984 to order
2、抗拉强度高（可达到14-15 N左右，一般单孔膜为3-6 N），柔韧性好（断裂伸长率达65% 左右，一般
Please Call +6012-3790984 to order