Today I have written about purification,
filtration and distillation and the equipment that goes with each process. This information should help you know how each method works. It is fairly long but I think that I
will go ahead and include everything so that you can compare one with another.
Purification
1. Boiling
- Water should be boiled for at least 3 to 5
minutes to sanitize it. If you live at high altitudes, add a minute
for every 1000 feet above sea level.
- Filter
through clean cloth to eliminate larger particulates
Negative points of this method –
1. Requires fuel
2. Cool-down
period
3. Evaporation
4. Will still
have particulate matter
5. Will not
eliminate pollutants
2. Chemical Treatment
Iodine
· Kills
most microorganisms
Negative points of using Iodine –
1. Not effective
against cryptosporidium
2.
The colder the water the longer it takes
3. Dosage
required varies
4. Should not be
used regularly for longer than 3 months
5. Changes the
taste of water
6. Pregnant women and people with
thyroid conditions should not use this method
7. Does not remove pollutants
Chlorine
Bleach
· Must
use regular household bleach containing 5.25% sodium hypochlorite. Do not use scented, color safe or
bleaches with added cleaners
· Use
8 drops of bleach per gallon of water, stir, let stand 30 min.
· Add
it when you use it, NOT when you store it
Negative points of using Chlorine
Bleach –
1. If bleach is
over 6 mos. old it may not have potency to disinfect
2. Chlorine is very poisonous and
may cause internal damage or death if used improperly
3. Ultraviolet – Purifies with UV
light
· Requires
electricity or batteries
· Sterilizes
microorganisms rendering them unable to make you sick
· No
chemical changes to water taste
Negative points of using
Ultraviolet purification –
1. Requires additional filtration to
remove particulates, chemicals, tastes and odors
Purifiers
on the market using UV light:
· SteriPEN
Sidewinder
· SteriPEN
Journey
· SteriPEN
Emergency
Filtration
1. Filters with Ceramic elements
- Smallest
pore size – 0.1 to 0.5 microns
- Most
expensive, most durable and maintainable
- Filters
out free floating particles and microorganisms
Negative points of using Filters
with Ceramic elements –
· Do
not remove chemicals, poor tastes, odors or pollutants
· Expensive
Purifiers on the market using
Ceramic Filtering Elements:
· Katadyn
Pocket Microfilter
· Katadyn
Combi
2. Filters with Glass fiber or compressed surgical paper
elements
· Small
pore size – 0.2 to 1.0 microns
· Mildly
expensive, medium durability, and usually not cleanable
· Filters
our particles and microorganisms
· Good
for camping
Negative points of filters with
glass fiber or compressed surgical paper elements:
· Do
not remove chemicals, poor tastes, odors or pollutants
· Not
good for long-term storage because they can develop mold and
Mildew and are hard to clean
Purifiers on the
market using glass fiber elements:
· Katadyn
Vario
· Katadyn
Hiker Pro Microfilter
· Katadyn
Hiker Microfilter
3. Filters with Hard-block carbon elements
· Small
pore size – 0.4 to 2.0 microns
· Less
expensive, brittle, not cleanable
· Used
as absorption filters
· Reduces
chemical quantities, poor tastes, odors and many pollutants.
· Used
together with other filters as second or third stage filters
Purifiers on the market that
use a combination of the above methods:
· Aqua
Pail
Distillation - with the use
of a heat source of solar energy
- Drinking
water can be distilled from almost anything that contains moisture except
materials that give off toxins
- Inexpensive
to make (FEMA website
describes in detail how to make stills for distillation)
Negative points of using
Distillation –
1. Process is extremely slow
2. Only small
amounts can be collected daily.
It is best to educate
yourself on the characteristic of each process and type of equipment so that
you will know what each is capable of doing. It is recommended that methods be combine to get the purest,
best tasting water.
Before I started studying, I
thought all filters were basicly the same except for capacity and cost. I had no idea of the capabilities of each
type of equipment. Now, I must
make the best choice based on my budget, needs and what I have learned. I hope that this information has been
helpful to you. If you would like
to purchase water purification/filtration equipment, please visit my website at:
The information I used above came from an article titled
“Water Filtration and Purification” written by Scott Pedersen, Vicki Tate and
Barry Crockett found at
http://beprepared.com/article.asp_Q_ai_E_30_A_name_E_Water%20Filtration%20And%20Purification,
an article titled EMERGENCY WATER PURIFICATION by The Law, Science & Public
Health Law Site at http://biotech.law.lsu.edu/cphl/Practice/water.htm and the
FEMA website at
http://www.fema.gov/plan/prepare/watermanage.shtm.
I highly recommend studying these articles; they have a lot of good
information.