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Survival Water Filter DIY – What to do in an Emergency!

Prepper Aaron
May 6th, 2019
The Simple Prepper
Comments (18) Read by 3,623 people

This article was originally published by Prepper Aaron on The Simple Prepper.

Preppers, how do you filter water in an emergency… without a filter?  Filtering water is not something most people normally spend much time thinking about – after all, the water that comes out of your sink is perfectly safe to drink. But during an emergency or in a survival situation out in the wild, you cannot take potable water for granted. In those situations, knowing how to purify water without a filter on hand or how to make a water filter in the wild can be the difference between life and death.

Thankfully, there are a number of survival water filter DIY methods that can work in a pinch and require only materials that you are likely to have on hand around the house or can find in the backcountry. This is a case where studying these methods a little bit ahead of time can make an enormous difference in your ability to survive in an extreme situation.  Also, be sure to check out our field-tested review of the Katadyn Hiker Pro as a great backup water filtration system to keep handy for emergency situations (or to barter with).


4 Easy Methods For Filtering Water In An Emergency

1) Sand and Charcoal Water Filter

One of the simplest filters you can learn how to make in the wild or at home is a sand and charcoal filter. This water filter will not purify your water, but it does an excellent job at turning very dirty and cloudy water into clear liquid that can then be boiled to remove microorganisms.

To make this filter, you will need sand, some gravel or small rocks, charcoal from a wood fire, a container such as a hard plastic bottle or a plastic bag, and a coffee filter or a fabric that water can pass through. If you are using a bottle as your container, take the cap off and cut off the bottom of the container, then invert the bottle. If you are using a plastic bag, leave the top end open and cut a small hole in the bottom of the bag. Push the coffee filter or piece of fabric to the bottom (cap end) of the container or bag so that it is covering the hole, then add an inch or two of charcoal. On top of the charcoal, interleave layers of sand and gravel so that you have at least two layers of each.

Once the filter is set, you can hang it from a tree branch or simply hold it suspended over a collection container and pour dirty water into the top of the filter. The water that comes out should be relatively clear, but you’ll need to purify it either by adding chemicals or by bringing it to a rolling boil for five minutes before drinking.

2) Evaporation Trap for Collecting Water

If you are planning to rely on filtering your own water for a long time, building an evaporation trap is a significant time investment but can serve as a semi-continuous source of filtered water. To make this, you’ll need to find an area that sees direct or indirect sunlight throughout the day and then dig a hole that is about one to two feet deep and a few feet around in that spot. Once the hole is dug, place a collection container in the bottom of the pit – be sure that no dirt gets into the container in the process. Place a plastic sheet so that it covers the entire pit and use rocks or branches to hold it down somewhat tightly. The last step is to place a small rock in the center of the plastic sheet, just over the collection container so that the sheet dips down over it.

The resulting trap should allow water to evaporate out of the soil in the hole when the sun hits it, but the plastic sheet will prevent it from going far. The water will then drip down to the depression in the center of the plastic sheet, right over the collection container. Unfortunately, in order to drink the water, you will still need to purify it by boiling or with chemicals, which requires undoing and redoing the plastic sheeting each time.

3) Solar Still For Collecting Water

Just like the evaporation trap, it is possible to make clean water using the power of the sun with a solar still. This method uses a large mixing bowl from around your house rather than a pit, and you will need to have unclean water to fill the bowl with rather than relying on groundwater. To make a solar still, place a cup or can inside the bowl of water so that the rim of the cup is below the rim of the bowl but remains above the level of the water. Cover the entire setup with plastic wrap and place a rock or other weight directly over the cup. Just like for the evaporation trap, the water will evaporate when the sunlight hits it, collect on the plastic wrap, and then drip into the collection cup. Again, this water will need to be purified with chemicals or by boiling prior to drinking it.

4) You Can Use Household Chemicals to Purify Water

If disaster strikes when you are at home, chances are high that you already have a stash of chemical treatments around the house that can be used to purify water without a filter. When using chemical treatments, it is important that you have water that is relatively free of particles – straining dirty water through a t-shirt, cloth, or whatever fabric you have on hand will work, and folding the fabric a few times will increase its filtering power.

The first chemical to turn to is bleach. Almost every household has a container of bleach around – just check under your sink or in your laundry room if you are not sure. To purify pre-filtered but potentially bacteria-filled water, simply add 1/8 teaspoon of bleach per gallon of water, mix, and wait at least and hour before drinking. If the water does not smell of chlorine 30 minutes after adding the bleach, you should repeat the process since your bleach may have exceeded its stable shelf life.

If you have a pool, the chemical in pool shock, calcium hypochlorite, also works well to purify water. Pool shock is extremely potent and stable for up to a decade, in contrast to store-bought bleach. You’ll need to dilute the shock powder by adding ½ teaspoon to one gallon of water, then add that to water at a concentration of 1% (approximately 2.5 tablespoons per gallon of water).

You may also find iodine in your medicine cabinet, which is okay for short-term use as a water purifier but can be dangerous for pregnant women or people with thyroid problems. Add 20 drops of 2% iodine solution to each gallon of water, mix, and wait at least an hour before drinking.


Filtering and Purifying Water Can Be Easy!

While these DIY survival water filters may not produce water that is 100% free of particles, they can turn water that is too dirty to drink into a viable source of sustenance. Some of the methods are perfect for short-term survival, while others, like the evaporation trap, are more suitable as long-term survival solutions for when you will be staying in the same spot for days or weeks. Remember that with any of these filtration methods, you will need to purify your water using the chemical methods described above or by bringing it to a rolling boil. Therefore, it is important to stock your emergency preparedness kit with chemicals for purification or with a significant stockpile of fuel for boiling large volumes of water.

Knowing these methods could be the difference between life and death in an emergency situation!  However, an easier way is to simply have a small portable water filter handy.  Check out our field-tested review for the Katadyn Hiker Pro here.  We think its the best all around water filtration system for emergency situations!

 


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Author: Prepper Aaron
Views: Read by 3,623 people
Date: May 6th, 2019
Website: https://www.thesimpleprepper.com/survival/skills/survival-water-filter-diy-what-to-do-in-an-emergency/

Copyright Information: This content has been contributed to SHTFplan by a third-party or has been republished with permission from the author. Please contact the author directly for republishing information.

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18 Comments...

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  1. Genius says:

    Any of the above methods are better than using a berkey black filter with it’s 100% failure rate. Don’t take my word for it, read the reviews. The glue that they use to attach the filter to the base fails and allows water to just pass right by. They have known about this issue for YEARS and not done a damm thing about it. I see a lot of people are dropping the berkey filter ads, good, they need to be put out of business.

    • Genius says:

      If you were unfortunate enough to have purchased one (as I did) you can patch it up by putting food grade silicone adhesive about an inch up from the bottom of the base and work it in and down around the base itself. Be generous with the silicone.

    • violent one says:

      True a few years back but this has been corrected. I returned mine when this happened and received 2 new ones. I also have “First Need XLE ELITE water purifier & Katadyn water filters” as I don’t want to carry a 5-gallon bucket around the woods.

  2. Justice says:

    Mac, this is a very good educational article. It’s good that this site remains a prepper site. Where we can communicate and support fellow like minded people.

    Did the YouTube video post okay all I’m seeing is a black box? But I have been having computer problem lately.

    • buttcrackofdoom says:

      all i see is black too, justice. one thing not mentioned is to let the water settle for a couple hours or more. this may allow MOST of the contaminants to go within an inch or so of the bottom, so you don’t get that into your filtration, clogging it up.

  3. Dead Meat says:

    Funny, 2 years ago I decided to post prepper tips in the comments. First one I did was evaporation method, and I was mocked. How the tides turn….

    • buttcrackofdoom says:

      i have HEARD that the evap method works VERY slowly, and is not a viable way to get enough water to stay alive……has anyone here had REAL EXPERIENCE/SUCCESS with it?

  4. “Iodine can be dangerous for people with thyroid problems” Really???

    Iodine deficiency causes thyroid problems.

    Better read “Iodine, You Can’t Live Without It” by Dr. Brownstein.

    .

  5. Ketchupondemand says:

    We’ve been collecting rainwater for years and use bleach as the main disinfectant.
    And, we could probably do without it completely as there are no factories/smokestacks or what have you within 600 miles or more.
    But I gave up on charcoal in the first stage of filtration.
    Unless you use fine activated charcoal (not cheap) what happens is water just runs right off lump charcoal.
    Test it yourself. Take a somewhat flat piece and put a drop or two of water on it.
    An hour later it’s still there. It doesn’t penetrate through the charcoal, which is what you want.
    Try using 1/2″ thick charcoal filter media pads used in the fish aquarium industry. Priced right, about 18″ square, cut to fit, or stack a few into the filter barrel like I do.
    Find them on that bay site, brand is called deep blue.

  6. Cool and informative write up. Easy to remember and simple says:

    Cool and informative thanks

  7. Rock Roller says:

    Lots of informational videos on you-tube of guys making cheap homemade water filters out of 5-gallon buckets and Home Depot parts. I’ve made all kinds of cool handy stuff watching vids there.

  8. LIFESAVER Jerrycan ,i have used this system in my off road endeavors ,at home camping proving systems. All have a pump and this is a Water purifier . Charcoal filter also . Second system is my WHISKEY STILL from the company of the same name you also can make a good whiskey also by going to the 99 cent stores an buy cheap cans of corn for a simple mash.

  9. Dumbo says:

    “after all, the water that comes out of your sink is perfectly safe to drink”

    Say what? The water that comes out of MY sink is FILTHY DIRTY WATER, and is DEFINITELY NOT safe to drink!

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