Are there not enough water filters on the market?

Definitely not, if you are looking for a filter system of extremely high quality
referring to high retention of particles, secure restraint of germs, high adsorptive
capacity, long forced adsorption-time, absolutely preventing dirt particles once
filtered to detach themselves or to be re-stored and if you want to buy such
technology for a good price.
In this case you should favour of the  BLOCKFILTER ®.
Among others the detachment of particles and/or re-storing of filtered substances
as well as the poor exploitation of the adsorptive capability are the most often cited
disadvantages of activated carbon filter systems using granulated material.
Therefore the requirement was set to develop a solid and reliable bloc filter element
which can be employed in various civil and technical applications.
The BLOCKFILTER® ensures that the pores in which the adsorption process
takes place will neither be stuck together nor will be sealed, thus ensuring a reliable
forced adsorption as well as a forced and continuous ultrafiltration.
The BLOCKFILTER® with a filter fineness of 0,005 mm (5 μm •) detains reliable
dirt and floating particles. Choosing a filter fineness of 0,0003 mm (0,3 μm) it will
additionally detain germs.
The BLOCKFILTER® distinguishes itself by:
its solid firmness, its high and steady porosity, its solid composite structure among
every active carbon particle and its filter fineness down to 0,0003 mm (0,3 μm).
The BLOCKFILTER® is the successful outcome of producing a bloc filter by
using finest active carbon dust with the desired filter fineness.
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The BLOCKFILTER® was developed in such a way that the percentage of the
activated carbon mass is high enough to be regularly spread throughout the entire
bloc with the result of constant firmness.
The BLOCKFILTER® does not consist of non-permeable composite material
just connecting and sticking together activated carbon particles, its composite
material itself becomes a permeable mass of a self-supporting grid structure in
which the activated carbon particles are embedded.
With the BLOCKFILTER® a “carbon bloc” has been manufactured being
extremely stable and porous and whose inner surface morphology is of such extent
that deposits in the
range of approximately its own volume can be filtered. This means that within one
litre filter volume of the  BLOCKFILTER® approximately 0,9 litre of deposits
can be retained until the filter is blocking up.
The difference between the various filtration techniques:
a) Granulated activated carbon in combination with ceramic filters
Combination with ceramic blocs having a filter fineness down to 0,2 •μm provide
sufficient protection from germs but not a reliable adsorptive capability of the
activated carbon bed. The adsorptive capability of granulated activated carbon can
be optimized for instance in waterworks by frequently surveying and controlling the
filtration process and adjusting the water flow to an optimal contact and dwell time
of the water in the activated carbon bed. This is not the case when using customary
filter systems in households since the flow rate is depending on how much water is
pored out of the water tap.
In general, if granulated carbon is employed the adsorption pores require a defined
dwell time and a controlled flow of the filtration medium in order to optimally hold
back pollutants or in other words to guarantee an optimal “loading” of the activated
carbon medium.
In order to obtain the cleanest filtrate the less “loaded” activated carbon elements
(grains) should always be at the exit of the filter bed. This, however, can only be
assured if the filtration process is frequently monitored and controlled for instance
by adjusting the dwell time, ensuring the right flow rate, diverting polluted water
etc. These measures are sufficiently carried out only in waterworks.
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Dirt and floating particles which are beyond the “virtual mechanical filter fineness”
of the granulate and/or other pollutions cannot be removed from the water. A
downstreamed ceramic filter with a filter fineness down to 0,2  •μm can remove dirt
and floating particles, however it cannot adsorb pollutions, which have passed
through the activated carbon bed because of an insufficient dwell time or the
exhaustion of the adsorptive capacity.
Compared to the BLOCKFILTER® the active surface of these combined filter
systems, comparing mass relation and volume, is relatively low. In addition these
filter elements are more expensive and their production is more energy consuming.
Disadvantageous re-deposition and/or detachment of pollutants will not take place
when applying the  BLOCKFILTER® because of its solid bloc structure. Every
dirt or floating particle or germ must deposit on the outer surface of the 
BLOCKFILTER® since they cannot penetrate the pores or they will deposit in the
chaotic labyrinth of the activated carbon dust being sintered to a solid bloc. Once
such a “stacking place” (one-way street) is blocked it will remain blocked. That is
why re-deposition and/or detachment cannot take place. In addition the adsorption
equilibrium - the necessary dwell time of a polluted fluid within the adsorption
pores until the cleaning process is terminated - is taking place in an enforced
manner while the fluid is passing through each adsorption pore.
The activated carbon grains have macro-, meso- und micropores with a diameter
ranging from 0,1 to approx. 0,002 μm and an active inner surface of 1.600 m² per
In our production process only approx. 10% binding agent is addes. This binding
agent is transferred to carbon material while undergoing the further production
In operation the amount of one litre of water will flow through the 
BLOCKFLTER® across a chemical pure inner surface of approx. 1,1 million m² within
one minute at a pressure of 4 bar thereby penetrating through a chaotic labyrinth.
b) The reverse osmosis
The membrane filtration of the reverse osmosis ensures extremely clean filtration of
polluted water but it is very sensitive with regard to water pollution, maintenance
effort, costs and water consumption. The advantage of highly pure and even
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demineralized water may be a decisive positive factor for various technical
But: demineralized water is no drinking water in the sense of food stuff and should
not be used in these areas.
It also has to be mentioned that these filter systems – if not properly maintained -
may suffer a rapid membrane damage. Pollutants such as dirt and floating particles
and /or germs being detached from damaged chambers will be poured into the
drinking water.
The reason for complaints of some people using reverse osmosis filter systems that
the filtered water has a plastic taste is caused by the fact that demineralized water is
aggressive against metallic as well as plastic type of pipes, thus taking off
plasticizer and/or ions of metallic material and resulting in a solution of the various
The BLOCKFILTER® does not effect the hardness of water.
Minerals will be retained.
More or less pollution of water, even under extreme conditions, have no negative
effect on the reliability of the BLOCKFILTER®.
c) Ion exchanger systems
In case of specific demineralization in the drinking water area ( i.e. nitrate
elemination) the BLOCKFILTER® can be combined with an ion exchanger
system. The anion exchanger medium takes out the non-healthy nitrate by
exchanging chloride. If exhaustion of the ion exchanger medium occurs the ion
exchanger may be easily regenerated using normal salt.
In case of extreme hardness of the water provided by the waterworks water
softening of the provided process water it can be feasible or even necessary. In
these cases the BLOCKFILTER® would be combined with an ion exchange system exchanging

magnesia and calcium ions against sodium. The used cation exchange medium
should be optimized related to the specific chemical composition of the water. The
demineralized water, however, will have to be mixed with mineralized water in order
to counter the negative effects of demineralized water on pipes (see above).
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To protect the pipe system and machines in the household the hardness of the
water should meet the requirement of 8 ° dH. Under these circumstances the quality
of the water meets the criteria as laid down in the “Verordnung über Trinkwasser
und über Wasser für Lebensmittelbetriebe (Trinkwasserverordnung-TrinkWV)”.
Properly configured the BLOCKFILTER® in combination with an ion exchange
system effectively contributes to each individual problem solution.
d) Physical system on the basis of magnetization
These systems are designed for water treatment and not for water processing. They
ought to change the crystalline structure of lime by means of interaction with
magnetic fields.
Neither they remove any dirt and floating particles nor they retain germs or other
pollutants being in the water.
- Additional remarkable water processing systems and gadgets are not known to us
  dhi-Filtertechnik GmbH