Water Filtering

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homebase_lonestar
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Water Filtering

Post by homebase_lonestar »

Just checking things off (and double/triple checking) my list as my trip to Isle Royale gets closer (Mid-July).

Does anyone have a water filter protocol they've used and trusted while on the island? I'm thinking about filtering water multiple times through different filters before I use it in my bottles or reservoir. Is that necessary or would one filter be enough?

Right now I have a Katadyn BeFree Filter on my bottle and a MSR thru-line filter on my reservoir. Is there any need to add another filter system/protocol before that?
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Re: Water Filtering

Post by IncaRoads »

On Isle Royale, it is recommended to use a 0.4 micron or finer water filter. The BeFree and MSR in-line filters are 0.1 and 0.2 microns, respectively. You should be fine with that setup.
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Re: Water Filtering

Post by homebase_lonestar »

Thanks IncaRoads, that's what I was thinking, just wanted a little confirmation!
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Re: Water Filtering

Post by TopCarrot »

I use a Sawyer and if I am in dirty water (edge of inland lake) pre-filter through a T shirt just to keep the solids out of the filter
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Re: Water Filtering

Post by Vandy »

Based on a suggestion here many years ago I use a coffee filter over the inlet.
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Re: Water Filtering

Post by torpified »

+1 on the pre-filter. IR sources can be mucky/gritty, which can clog a BeFree in a hurry. While I admire the multiple use aspect of the t-shirt method, I use a coffee filter: I keep my cookpot handy, and use it to scoop from the water source, then pour the water through the coffee filter into the squeeze bag.
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Re: Water Filtering

Post by backwoods doc »

Trying to wrap my head around the T-shirt method. Is this a clean T-shirt (now soiled and wet)? A dirty T-shirt (now more soiled and wet and less available as an emergency back-up)? A T-shirt that is currently being worn (some acrobatics involved)? A T-shirt currently being worn by an unsuspecting companion (the companion now lying in the drink and feeling betrayed)?
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Re: Water Filtering

Post by Iconic »

An Alaskan bud told me he uses coffee filters as a water pre-filter. Quite light for sure.
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Re: Water Filtering

Post by TopCarrot »

backwoods doc wrote: Sun Jun 12, 2022 2:15 pm Trying to wrap my head around the T-shirt method. Is this a clean T-shirt (now soiled and wet)? A dirty T-shirt (now more soiled and wet and less available as an emergency back-up)? A T-shirt that is currently being worn (some acrobatics involved)? A T-shirt currently being worn by an unsuspecting companion (the companion now lying in the drink and feeling betrayed)?
It had been my t-shirt, but now it will always be the unsuspecting companion. much better.
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Re: Water Filtering

Post by hooky »

Iconic wrote: Sun Jun 12, 2022 4:52 pm An Alaskan bud told me he uses coffee filters as a water pre-filter. Quite light for sure.
Back when I pumped, I would use a coffee filter for the inlet. Worked great. Now I use a Sawyer.

Using a gravity setup, I just let it sit a little longer in the dirty bag to settle out. If I'm not using a gravity set up, I just to keep the debris to a minimum by being careful about where and how I collect. I always have my syringe if I need to back flush my Sawyer.
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Re: Water Filtering

Post by homebase_lonestar »

Does anyone see the need to bring a purifier along or just throw some aquatabs in my bag just to be safe?
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Re: Water Filtering

Post by backwoods doc »

I don't use a water purifier or Aquatabs. My main concerns are Giardia and bacteria, and water filters take care of those just fine.
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Re: Water Filtering

Post by dcclark »

I've learned that there's a difference between a water purifier and a water filter. A purifier has much smaller pores that can remove viruses. Filters remove bacteria but generally not viruses.

The park's official recommendation is to EITHER use a purifier, or use both a filter and chemical treatment (like Aquatabs).

I've only ever used a filter and have been fine -- I agree that giardia especially is a major worry, and filters can manage it. But I would NOT use only chemical treatment.
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Re: Water Filtering

Post by Midwest Ed »

This may deserve it's own thread but with the talk of pre-filtering, I'm interested to learn how all the various sub-micron filters handle the Tannins found in most inland waters. This report would include how well they remove it and how often they clog (assuming visible particles have been pre-filtered) thus requiring maintenance. Tannin is another name for Tannic Acid which is the main chemical that gives the water varying degrees of a brownish tint. Tannic acid is harmless but at strong enough levels can add a bad taste. It is the product of fermentation of the various organic material available and is actually based on a very complex sugar molecule. There are filtration systems that supposedly remove it (although I'm thinking not suitable for backpacking) based on ionic exchange systems, some using a 2 stage chemical treatment.
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Re: Water Filtering

Post by Bobcat1 »

Tannic acid is soluble in water, so you get a 100-percent homogeneous solution(theoretically). A filter wouldn’t make much difference. Some chemical adsorption (activated charcoal, ion exchange media, etc) would be needed, which is how a home treatment system would typically work. I always like the way high-tannin water looks - picturing Taquemenon Falls in my mind. Like Iced tea. All the fluffy wind-borne stuff floating on the surface that you cannot see on less-brown water. The foam that naturally occurs as a result of natural saponins, I think they’re called.
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