Monday, November 14, 2011

Water - Storage, Purification and Filtration

Water makes up more than 2/3 of our body. We lose water by perspiration, breathing and urination. Within 3 days of dehydration our body's organs will suffer severe damage and lose functionality. With water being ESSENTIAL, we must know how to treat and store our water safely and effectively.

WATER STORAGE -- this portion has been taken from FEMA
How Should I Store Water?
To prepare safest and most reliable emergency supply of water, it is recommended you purchase commercially bottled water. Keep bottled water in its original container and do not open it until you need to use it. Observe the expiration or "use by" date.

If You are Preparing Your Own Containers of Water
It is recommended you purchase food-grade water storage containers from surplus or camping supplies stores to use for water storage. Before filling with water, thoroughly clean the containers with dishwashing soap and water, and rinse completely so there is no residual soap.

Follow directions below on filling the container with water.
If you choose to use your own storage containers, choose two-liter plastic soft drink bottles – not plastic jugs or cardboard containers that have had milk or fruit juice in them. Milk protein and fruit sugars cannot be adequately removed from these containers and provide an environment for bacterial growth when water is stored in them. Cardboard containers also leak easily and are not designed for long-term storage of liquids. Also, do not use glass containers, because they can break and are heavy.

If storing water in plastic soda bottles, follow these steps: Thoroughly clean the bottles with dishwashing soap and water, and rinse completely so there is no residual soap. Sanitize the bottles by adding a solution of 1 teaspoon of non-scented liquid household chlorine bleach to a quart (1/4 gallon) of water. Swish the sanitizing solution in the bottle so that it touches all surfaces. After sanitizing the bottle, thoroughly rinse out the sanitizing solution with clean water.
Filling Water Containers
Fill the bottle to the top with regular tap water. If the tap water has been commercially treated from a water utility with chlorine, you do not need to add anything else to the water to keep it clean. If the water you are using comes from a well or water source that is not treated with chlorine, add two drops of non-scented liquid household chlorine bleach to each gallon of water. Tightly close the container using the original cap. Be careful not to contaminate the cap by touching the inside of it with your finger. Place a date on the outside of the container so that you know when you filled it. Store in a cool, dark place. Replace the water every six months if not using commercially bottled water.

For more information on water storage go here.

WATER PURIFICATION -

There are many ways to purify water...and none are perfect. Sometimes it is best to use several different methods.

BOILING: the most common method...boil water for 3-5 minutes. Cool to drink. It will taste better if you add oxygen by pouring water back and forth from 2 clean containers.

Pros: easy, quick
Cons: takes a lot of fuel, some water evaporates, does not rid of foul odors or smells and does not filter water of particulates

CHLORINATION: also taken from FEMA
You can use household liquid bleach to kill microorganisms. Use only regular household liquid bleach that contains 5.25 to 6.0 percent sodium hypochlorite. Do not use scented bleaches, color safe bleaches, or bleaches with added cleaners. Because the potency of bleach diminishes with time, use bleach from a newly opened or unopened bottle.

Add 8 drops (clear water) and 16 drops (1/8 teaspoon - cloudy water) of bleach per gallon of water, stir, and let stand for 30 minutes. The water should have a slight bleach odor. If it doesn’t, then repeat the dosage and let stand another 15 minutes. If it still does not smell of chlorine, discard it and find another source of water.

Other chemicals, such as iodine or water treatment products sold in camping or surplus stores that do not contain 5.25 to 6.0 percent sodium hypochlorite as the only active ingredient, are not recommended and should not be used.

Pros: simple and fairly quick
Cons: must have "potent" enough bleach (not more than 6 months old), too much bleach can be poisonous and even deadly

FILTRATION: information taken from here.
Water filtration simply means to strain out the impurities from a water source. The larger the impurity particulate the easier it is to filter. The opposite is true also, the smaller the impurity particulate, the harder it is to remove. Thus, the size of the filter pore and the durability of the filtering element are important to the filter’s longevity and ability to perform. Most filtering elements are made of ceramic, glass fiber, hard-block carbon, or materials that resemble compressed surgical paper.

Ceramic elements (most expensive, most durable, and maintainable) have the smallest pore size (0.1-0.5 microns) and are used by some of the leading portable water filtering companies in the world. Portable ceramic filters boast an impressive list of long-term users, such as: International Red Cross, World Health Organization, Armed Forces (USA, Germany, Portugal, Switzerland, and US Navy Seals), United Nations, and the FBI. Ceramic elements can filter only free floating particulates and microorganisms. They do not remove chemicals, poor tastes, odors, or pollutants.

Glass fiber elements and compressed surgical paper (mildly expensive, medium durability, and usually not cleanable) also have small pores (0.2-1.0 microns). Like the ceramic filter, they remove only particulates and microorganisms, but they do not help much with pollutants. These are good low-cost filtering elements for home, backpacking and scouting needs, but they are not good for long-term storage because they can develop mold and mildew and they are hard to clean.

Hard-block carbon elements (less expensive, brittle, and not cleanable) have a small, but still effective pore size (0.4-2.0 microns). They are also used as an absorption filter. The best contribution that carbon makes to filtering is its ability to reduce chemical quantities, poor taste, odors and many pollutants. Because carbon is only mildly effective in filtering out particulates and microorganisms, it is mostly used as a second or third stage filter in home and portable water use. It is seldom used as a stand-alone filtering unit.

Filtration summary: taken from here.
There are two types of water filters, inexpensive travel water bottle filters and gravity carbon filters. A travel water bottle filter is great to throw into your disaster kit, but in cases of extreme contamination you would still want to add in a few drops of iodine or bleach. If you opt for a gravity carbon filter such as the AquaRain or Berkey ones, it MAY be enough purification, but we still recommend to use one of the other methods as well. It can never hurt to be too safe. If you are conserving fuel or on the run, a filter can definitely be a great option and is MUCH better than no purification at all.