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INTRODUCTION – DESCRIPTIONS AND DEFINITIONS
You have purchased one of the most technologically advanced Ultraviolet Water Treatment System available anywhere in the world. It
has been designed with you, the consumer, in mind.
PURA
®
products are lightweight, easy to use, and simple to maintain.
PURA
products will provide you with healthy, clean drinking water for years to come.
WHAT IS ULTRAVIOLET?
Ultraviolet (UV) light from the sun has long been known for its
ability to destroy microorganisms. However, it has only been in
recent years that equipment producing UV light has been
manufactured for residential use.
WARNING: NEVER LOOK DIRECTLY AT A LIGHTED UV
LAMP. ULTRAVIOLET RAYS CAN BE
HARMFUL TO EYES.
UV energy is produced by low-pressure mercury vapor
enclosed in a tubular lamp. While a UV lamp resembles a
standard fluorescent lamp, it is similar in appearance only.
Energy produced by the UV lamp has the ability to destroy
microorganisms that can live in water. There are five major
groups of microorganisms that are altered by a specific
spectrum of ultraviolet light: viruses, bacteria, fungi, algae, and
protozoa.
When these microbes are exposed to the proper amount of UV
energy, their DNA structure is scrambled, and they are unable
to reproduce. Since the cell is now sterile or dead, it is no
longer a threat.
WHAT IS ACTIVATED CARBON?
Activated carbon has been used for hundreds of years to treat
taste, odor, and color problems in water. Activated carbon has
been proven to be an excellent media to produce better tasting
water and to remove harmful water contaminants at a
reasonable cost.
Carbon used for filters may be manufactured from wood, coal,
or coconut shells. The raw carbon is ground up and “activated”
by heating the granules at a controlled temperature and
pressure.
This process causes the carbon granules to expand and create
active sites where pollutants can be collected by adsorption.
These new sites dramatically increase the total surface area
and capacity of each granule.
WHAT IS ADSORPTION?
Adsorption is the physical process where certain water
pollutants are attached to the surface of carbon particles as the
water flows through the filter. The pollutants are removed from
the water and locked into the carbon granule.
Activated carbon is also able to filter out sediment through a
process of mechanical filtration. The particles are captured in
the spaces between carbon granules.
PURA SYSTEMS
PURA
recommends that all UV systems include pre-filters to
process the water before it reaches the UV lamp. This will
ensure that maximum UV exposure is achieved.
PURA
UVB, UV20 and UVBB series offers integrated filters in
a single system. These integrated systems use a two-stage
filtration process:
First, a string-wound filter removes the suspended solids that
may shield the microbes and make it difficult to obtain sufficient
UV exposure. Second, an activated carbon filter removes
unpleasant tastes and odors.
PURA
Ultraviolet Water Treatment Systems are designed for
indoor use only.
PURA
Systems are designed to provide complete water
treatment in a compact, easy-to-use package. Please follow
the directions in this Guide exactly when installing your
PURA
System to ensure that it operates correctly.
The UV lamp requires a start-up period of one to two minutes
in order to achieve full intensity. Repeated starting of the UV
lamp will shorten its life.
Therefore, it is recommended that
the UV lamp remain on at all times during use.
CONDITIONS FOR USE
Source Water Supply Profile
Chemical Parameters
Max mg/L
Feed Water Pressure
†
20 – 75psig (138 – 517kPa)
Hardness (CaCO
3
)
< 120 (7 gpg)
Feed Water Temperature
38° – 105°F (3.3°– 40.5°C)
Iron (Fe)
< 0.3
pH Range
6.5 – 9.5
Manganese (Mn)
< 0.05
Total Dissolved Solids
<1500 mg/L
Total Suspended Solids
< 10 mg/L
Turbidity
< 5 NTU
†
Water Pressure must not exceed 75 psig
(517 kPa) or a pressure regulator
must be installed.
