Treating water is a personal choice. I always filter. EVERYTHING. I figure, I’m carrying a filter so if I get a water-borne illness because I chose not to treat my water, I’m pretty stupid. Afterall, that filter was in my pack! I would hate for my hike to end because of that.
That said, there are many people who do not treat their water. There are also many people who get sick. The people who advocate NOT treating water claim that people get sick because of not cleaning their hands properly after doing #2 or from sharing food with others. NOT because of drinking untreated water. Who really knows why people get sick.
There is something you can get from drinking snowmelt from the pink snow. I don’t know what this is. But up high in the sierras, a lot of the snow is pink. I think it’s some kind of algae. I had friends who didn’t treat their water and spent 5 days spewing it out of both ends at Vermillion Valley Resort. The doctor they went to said it was the pink snow. They were drinking water at high elevations without treating it. So, giardia is not your only worry.
I carry a PUR (it’s now the Katadyn) Hiker filter. I also carry Aqua Mira. Filters can clog so the Aqua Mira is my backup. There are some piped water sources where you can’t filter, so Aqua Mira is good at those. And, there are some REALLY suspect sources where I both filter and use Aqua Mira. I get about 1000-1200 miles from one filter cartridge.
Iodine is BAD for you. REALLY BAD. If you are going to chemically treat your water, use Aqua Mira.
Most PCT hikers use Aqua Mira. But in the last three years, I’ve seen an increase in the number of hikers who carry filters. In 2001, few people had them. In 2003, over half of the people I hiked with had them.
If you choose NOT to carry a filter, please do not ask to borrow someone else’s filter at a gross water source. If you think you’ll need to filter your water, carry your own filter. Don’t ask someone else to carry the weight for you.
You won’t always find fast, rocky creeks away from cows and people. You will get water from fields where there are both cows and cow sh*t. It will happen on more than one occasion. On the PCT, you take what you can get. Lots of times, your water sources are 15 miles apart.
I would guess I drank about 1.5 gallons per day.
Backpacker has a long article about water treatment in the latest issue.
yogi