Here's an interesting idea, a carbon filter in the Guyotdesigns bottle. Carbon takes out pesticides, chemicals,etc. I wonder if this will be as effective as my Katadyn combi for chemicals, could take out the filter for chemicals leaving just the steripen. Would be a great weight reduction.

http://www.guyotdesigns.com/site/htm/home.html

TapGuard makes safe water taste better by removing chlorine and other chemicals that can give tap water a bad taste.
Introducing the TapGuard from Guyot Designs. Add it to your widemouth bottle and you've got carbon-filtered water from any safe source.

# Package contains a TapGuard unit and two replacement carbon filters, enought for 200 liters of great water.

# Fits CamelbackTM, NalgeneTM,
and most wide mouth bottles.

# Save money, save the earth - replaces hundreds of disposable bottles.

# Carbon filter material made in the USA.

Given that there is no separation between "clean" and "dirty" water, this is probably best used to remove unpleasant tastes , rather than actual filtering. Too much chance of mixing the two

I can see the use for an ultralight, streamlined kit. A lot of my water sources may have ag or industrial chems in them.

Already owning their SS bottle, I may look into this. There products are all pretty well made...

I really wonder if any water going thru that filter has enough dwell time in the filter to actually make any difference?

Hi

Are you sure that this device can filter pesticides ?

As far as I know (I might be wrong on this), only reverse osmosis can effectively filter organic phosphate compounds.

I doubt that this filter can take out something like pesticides... if it did, then their sales literature would mention it.