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| MULTI-MEDIA WATER FILTERS (Depth Filters) |
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Multi-media water filter
system represents a significant improvement over
single-media filters. This is primarily due
primarily to improved filter bed action based on
the innovative use and selection of filter
media. Multi-media filtration permits delivery
of high quality filtered water at much faster
flow rates, as compared to a conventional sand
filter.
In a conventional sand filter, lighter and finer
sand particles are found at the top of the
filter bed, and coarser, heavier sand particles
remain at the bottom after backwashing.
Filtration takes place in the top few inches of
the filter bed.
A multi-media filter is backwashed in the same
manner as a sand filter, using reverse or upward
flow of water through the filter bed. The
various layers of media retain their
stratification because each material has a
different density.
Advantages
1. The multi-media water filter systems operate
for much longer periods of time (five or more
times as long at the same filtration rate),
before backwashing is necessary because the bed
can hold more turbidity. Turbidity is trapped
and held throughout the entire bed depth, rather
than the top one or two inches.
2. Multi-media filtration is much better suited
for use in a closed pressure tank since cracking
of the bed, and subsequent breakthrough of
turbidity is virtually eliminated and the need
for visual inspection is unnecessary.
The use of pressure tanks, rather than open
basins or filters, is an obvious advantage for
point-of-use filtration and could also be of
real importance in the filtration of small
community water supplies.
More rapid filtration flow rates in multi-media
filtration allow the use of smaller diameter
tanks with equal or better results.
3. A very high degree of clarity is achieved in
the filtered water because of the fact that the
finer particles of garnet at the bottom trap
finer turbidity particles.
4. Another important advantage is that
multi-media water filters can clarify water at a
much higher flow rate than a single-media sand
filter (5.5 to 8 gallons per minute, as compared
to 1.5 to 2.5 gallons per minute in a 12 inch
diameter tank). This is 14 to 15 gpm per square
foot of bed area, as compared to 2 gpm per
square foot of bed area. This is a very
important difference in the production of
filtered water.
CWG's multi media water filters (MF-1100,
MF-1000, MF-600, MF-500 MF-450, MF-410 MF-400
Series) clarify water by removing sediment,
turbidity, iron, unpleasant tastes and odors,
suspended particles, and unwanted color, all of
which are commonly found in surface water. They
can be used in a variety of service conditions
including, but not limited to: industrial,
municipal, and institutional applications.
CWG multi media water filter systems are
ideally suited for use where stringent water
quality standards are required or where higher
levels of suspended solids are present. These
applications can include re-use applications,
water pre-treatment applications for reverse
osmosis and deionization systems or as a
pre-treatment system prior to disposable bag or
cartridge filters. CWG multi-media water
filter systems are also widely used as primary
water filters for removal of suspended solids in
incoming plant water or in waste water clean up
applications.
With expertise of CWG water filter
systems, you will receive economical solution
that creates value for you while reducing your
costs.
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