Reverse Osmosis
Water Filters Process
The Reverse Osmosis process is
the same process that many hospitals throughout the world use to make certain
that their pharmaceutical water is of the highest quality.
Over 40 million Americans need to
restrict their intake of
salt because of high blood pressure, yet almost every water
supply has sodium chloride in it.
A home reverse osmosis system can
substantially reduce dissolved metals such as Calcium, Magnesium, Sodium
and Manganese as well as brackish minerals salts,
Chlorides Chemicals, Germs, Radioactive rays,
Pesticides and other tastes.
Water contains total dissolved
solids.
TDS is the measurement by weight of dissolved
materials in a given volume of water. If a material
will completely dissolve and is not visible in the water,
it is part of the total dissolved solids.
Reverse Osmosis helps to lower
the TDS content in
the water (such as brackish water, or seawater) since
substances such as calcium, magnesium, and sodium
can not readily pass through the seem-permeable
membrane, while water can. With the assistance
of water pressure, impurities are removed and sent down the drain.
Reverse Osmosis is a membrane
process that acts
as a molecular filter to remove up to 99% of all
dissolved minerals. The pores in the membrane are
about .0001 micron. To give you some perspective,
the smallest known bacteria is .02 micron.
Water passes through the membrane
while the
dissolved and particulate materials are left behind.
As pressure is applied to the concentrated solution,
the flow is reversed and water is forced through the
membrane from the concentrated side to the dilute side.
The central part of the reverse
osmosis system is the
module which is a pressurized container housing the
semi-permeable membrane. Cellulose Triacetate (CTA)
membrane are used for chlorinated supplies.
Thin film composite (TFC) long life membranes are
used for non-chlorinated supplies.
Here the feed water will be
separated into unable product
called permeate and waste product called concentrated.
The product water may then pass into a diaphragm tank
which holds the water until it is taken from the discharge
faucet by the user.
The home Reverse osmosis system
operates on line or
system pressure. No electricity is needed. Its compactness
allows the system to fit easily in a small area, often
under the kitchen sink or in a cabinet.
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