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The efficiency of ultraviolet irradiation for the
sterilisation of water
Ultraviolet disinfection is now a well-proven and accepted
technology for a wide range of water treatments.
Ultraviolet kills microorganisms by penetrating the cell
wall and rearranging the dna thereby preventing the organism
from reproducing.
Ultraviolet disinfection not only eliminates the storage and
use of toxic chemicals, it eliminates environmental concerns
and provides the ability to save considerable costs in water
supply.
Pristine water systems is happy to answer your questions on
ultraviolet sterilization or any queries you may have
regarding the cleaning and treatment of water.
Media Filter
Whole of house
filters
Calcite Filter
From
domestic, farm water to Industrial water for pH correction,
or acid water conditions where pH is lower than 7
The media is
calcite rock which is filled not higher than 300mm from top
neck of the cylinder.
The low pH
water enters the chamber by a simple 40 mm manifold, flows
through the calcite rock which automatically dissolves and
corrects the pH to a level at or above 7.
Unit has a
back flush head to enable periodic flushing to remove any
sand, grit, or other impurities that may accumulate
Port hole
entry allows access to the top of the vessel for topping up
of calcite at least annually.
Post washable
or disposable filter should be fitted after unit for
domestic use to avoid calcium dust from clouding water.
This is
internationally recognized as the most successful and safest
method of correcting low pH and corrosive water conditions.
The vessel is
a spun wound fibreglass unit tested to 600kpa.
The manifold
is UV stable durable plastic.
Granulated activated carbon
About
Carbon
Carbon is a
substance that has a long history of being used to absorb
impurities and is the most
powerful
absorbent known to man.
For
centuries, sailing vessels used it to store drinking water
for long voyages. Carbon is also commonly used as an
effective antidote for swallowed poisons.
Activated
carbon is carbon which has a slight electro-positive charge
added to it, making it even more attractive to chemicals and
impurities. Loose granular activated carbon (GAC) is used
extensively
in most of the commonly encountered water filters today.
Most of these filters have ratings as simple taste and odor
filters or as pre-filters designed to remove initial dirt,
rocks, sediment, etc. When water is forced through a
substrate of GAC (which has the consistency of sand or
coffee grounds) it takes the path of least resistance and
makes its own channels through the GAC in the filter.
What this
means is that the water being filtered is notcontacting the
GAC for enough time to allow complete absorption of
impurities to take place. Man impurities seep through along
with the "filtered" water. This fitler enables you to back
wash the filter, in turn reseating the carbon bed and
changing the waters path to maximise filtering ability. This
cannot be done easily with canister type filters such as the
big blue systems.
About
Silver Carbon
When the
water passes through the GAC, some bacteria (primarily
heterotrophic) are trapped in the substrate, too. The
problem is that these trapped bacteria multiply prolifically
in the warm, moist oxygen-containing environment among the
grains of GAC. Because the GAC is loose, there is no barrier
to keep any bacteria growing inside the filter from coming
out with the water pushed through each time the filter is
used.
Silver
impregnated carbon, although more expensive, prevents the
bacterial colonies from habituating in the carbon. It’s
common for Silver carbon to last 5 times longer than
standard GAC on non treated water . Silver GAC should be
considered for tank, bore , or river water, if untreated if
your water prematurely goes smelly or slimey as a result of
bacterial contamination. |
