Questions tagged [water-purification]

Questions about making the water found outdoors safe for drinking.

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58
votes
10answers
13k views

What is the safest way to purify water?

There are a number of ways to purify water, off the top of my head we have filters, iodine, and boiling. Clearly each has some advantage/disadvantage (iodine tastes terrible, boiling takes time). ...
29
votes
6answers
13k views

Do you need to purify all mountain water sources

I was just reading this question What is the safest way to purify water? Now I walk a lot in Snowdonia in North Wales and on occasion I drink from mountain streams. I've even camped next to mountain ...
37
votes
1answer
38k views

How much sea water can I safely drink?

Anyone who has played in the ocean knows getting a little sea water in your mouth and swallowing it will not kill you. Seawater contains salt. When humans drink seawater, their cells are thus ...
31
votes
4answers
40k views

What are the different methods to purify water?

What methods can I use to purify water? And what's the difference between those several methods (safety, duration needed, ...)?
56
votes
4answers
187k views

How long does water need to be boiled for to kill all bacteria / viruses?

This has come up a few times in a few other questions, but I've heard varying opinions from different people in a number of answers and comments on here - some saying that just boiling for a moment is ...
26
votes
4answers
3k views

Why are people so worried about Giardia?

Everyone I have ever been camping with seems to have an unwritten rule never to drink from streams no matter how clear they might seem, for fear of Giardia. I have also heard people telling about ...
13
votes
2answers
5k views

How do you boil water without a proper container?

Suppose you don't have a pot or any other fire proof container to boil water in, but you need to boil it for safe drinking water. How else can you boil the water?
53
votes
4answers
33k views

Is drinking urine safe?

We've all heard stories about how people saved their lives by drinking their urine. Is drinking urine safe when there are no other water sources available? Can I filter it with a water purifier?
25
votes
5answers
28k views

Can any waterborne pathogens survive boiling?

I know that boiling does little to break down chemical contaminants or heavy metals. But I'm unsure if it kills all microbial life. Are there any waterborne illness-causing viruses/bacteria/protozoa/...
6
votes
2answers
39k views

What is the minimum amount of water per day to survive?

I am disabled in the wildness, there are no natural water sources available. I have 2 gallons (7.5 liters) of water. The only practical solution is to sit and wait for rescue. I will be resting in ...
11
votes
3answers
1k views

How do you make an emergency water filter and purifier?

How do you make an effective water filter using the natural elements of the great outdoors? Suppose your only source of water was dirty and questionable at best. How could you make it potable without ...
38
votes
4answers
13k views

Ways to desalinate water when “lost at sea”?

In recent news reports that all seem to be saying the same things: Jakarta Post Indonesian teenager survives 49 days adrift in Guam waters NPR: 19-Year-Old Survives 49 Days At Sea After Floating Hut ...
31
votes
7answers
10k views

Where in the Alps is it safe to drink the water without filtering?

In some places, the Swedish Lappland for example, it's perfectly fine and even recommended to drink water directly from streams. Is it also recommended whilst hiking in the Alps, and if so is it only ...
14
votes
1answer
5k views

Safe to use Old Water Filter?

I have a PUR Hiker Microfilter and a Katadyn Water Microfilter sitting in my closet that I only use once in a great while (I don't go on overnight backpacking trips very often). Whenever I do plan on ...
13
votes
2answers
1k views

What backwoods trick to get pure water produces the most safe water?

So I read this answer and I was wondering what contraption produce the most water when you don't have a water source? So what water trap produces the most water? Specifically, what should I do with my ...
9
votes
1answer
2k views

Does water in the sun get purified from or polluted by algae, fungi and bacteria?

We live at 27° latitude, about 200 metres above sea level and drink water from PET bottles laying around on the soil (SODIS method). They are filled with fresh water from a well and reused over and ...
4
votes
1answer
272 views

Can sunlight be used to purify water? [duplicate]

I have an ultraviolet water purifier. It uses ultraviolet light to kill 99.9% of all viruses and bacteria in one litre of water in 90 seconds. I was wondering: if UV light can purify water, then if ...
26
votes
2answers
5k views

In a survival situation, should I drink unpurified water?

If I am in a survival situation, is there any reason I shouldn't drink the available water? I am aware of Giardia and cholera. Are these worthy concerns, or are there good enough cures available that ...
16
votes
3answers
27k views

Water filters - why sand and rocks?

Saw a video on youtube where some guy made a water filter out of a bottle, charcoal, sand and little rocks. He commented that since the charcoal is very porous it's great for filtering. Then, after ...
11
votes
5answers
22k views

Is pouring boiling water into a plastic Nalgene bad for you?

I've heard that pouring boiling water into a Nalgene-style bottle is either completely fine or definitely going to kill you. Which is it? Are there any scientific studies demonstrating exactly what ...
9
votes
2answers
1k views

Is it safe to put snow in water filtration?

I was wondering if it is safe to put snow in water filtration and then just wait until it melts down if the temperature is right. Of course, carefully picked, clean looking snow.