Water Purification or Water Filtration
It is common
to see the terms ‘Water Filtration’ and ‘Water Purification’ used
interchangeably. The truth is that they really are two separate, but
closly related things.
Each has a role to play in providing
your family with healthy and tasty water for your family, and each is
available in a variety of forms.
Put simply, a filter removes
particulates and other impurities from your families home water supply.
It does so by trapping these particles in the filter cartridge using
varies media such as carbon blocks, Ultrafiltration membranes, GAC or
KDF. A water filter also gets rid of protozoa and parasites, even
bacteria, but it does not remove viruses.
systems, on the other hand, use a filtering process that removes
impurities and adds the extra step of disinfecting the water by
eliminating viruses. In fact, the Environmental Protection Agency (EPA)
has set standards that require water purifiication systems to eliminate
99.9% of all viruses.
In general, if your families water
supply comes from a municipal water supply you really only need a water
filtration system to remove the chlorine and other impurities that may
be present in the water.
If your families water supply depends
on a well, a stream, lake, or maybe comes from rainwater harvesting
should consider one of the many effective water purification systems.
How can I Disinfect my Families Water Supply?
is accomplished both by filtering out harmful microbes and adding
disinfectant chemicals or using other methods in the last step in
purifying drinking water.
- The most common disinfection method. Although chlorine is effective
in killing bacteria and viruses, it has limited effectiveness against
protozoa that form cysts in water such as Giardia lamblia and
Cryptosporidium which are both pathogenic.
- Ozonation -
uses an unstable molecule, a "free radical" of oxygen which readily
gives up one atom of oxygen providing a powerful oxidising agent which
is toxic to most waterborne organisms.
- UV radiation (light)
- is very effective at inactivating cysts, as long as the water has a
low level of color so the UV can pass through without being absorbed.
- Water is boiled long enough to inactivate or kill micro-organisms
that normally live in water at room temperature. Near sea level, a
vigorous rolling boil for at least one minute is sufficient.
- involves boiling the water to produce water vapour. The vapour
contacts a cool surface where it condenses as a liquid. This condensed
water is 99.9% pure water.