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Nanofiltration describes
a process of water purification that removes
contaminants from the water to produce clean, clear,
pure water. Nanofiltration is a form of reverse
osmosis, that will remove bivalvent hardness, calcium
and magnesium plus sulphates but leave in most of the
single valent sodium ion. Nano filtration can therefore
be used as a pretreatment of seawater. Nanofiltration is
used to soften seawater at low pressure (150 psi) before
using seawater RO at 800 to 1000 psi to remove the
sodium chloride. Nanofiltration is often chosen for hard
well water and similar waters where there is copper
pipe. This will soften and remove heavy metal and other
organic contamination, virus and bacteria while leaving
enough sodium chloride to prevent the corrosion to the
copper pipes.
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Like reverse osmosis,
nanofiltration can remove bacteria, viruses, organic
chemicals and pesticides. In addition, both procedures
can be used to remove calcium and magnesium to soften
hard water. However, there are factors that make
nanofiltration a more affordable option than reverse
osmosis.
In the past there used to
be a big difference between the pressure needed for RO
as compared to nanofiltration. Nanofiltration requires
a lower water pressure to operate, so energy costs
associated with it are lower. While new advances in RO
technology has reduced the difference significantly
there is still a difference. While the difference on a
home unit between reverse osmosis and nanofiltration
might be negligible, nanofiltration is often preferred
on a municipal level.
In short, nanofiltration is an effective and adequate
purification method for waters that are not
exceptionally salty or saturated with dissolved solids.
It is more energy effective than reverse osmosis, which
is why many cities and counties choose it over reverse
osmosis for wide-scale water purification. To learn more
about nanofiltration and reverse osmosis purification,
call Clean Water Products at 520-293-1561 to talk to one
of our hydrology experts today.
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