I work for medicine Sans Frontiers. And we use Chlorine rather than iodine. I have used both in Nepal while trekking. And both are fine. However, I do get the odd ulcer after I have used them for about 2 weeks. Recently however, I ordered a Japanese Water filter called the SUPER DELIOS. For weight and ease of use, this filter blows the other ones away. It only weighs 80grms. Is tiny and fits over any plastic bottle. I have used an MSR one before which is great. But just weighs too much. I have bought mine for next years trip to Nepal. I bought it for around £25. I am sure that you will be able to order online. In terms of weight...this is the lightest out there.
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BPL has same useful info on Aquamira (Chlorine dioxide), tho' you need a subscription to read the articles - but the forums are free. This thread says that the EPA, who approved Micropur MP1 (Chlorine dioxide tablets) for water treatment in the US, recomend a treatment time of 4 hrs for protozoa (Cryptosporidium and Giarda) when water temperatures are at 4C. The label for Micropur MP1 here seems to back that up. However, I can't find MP1 on the Katadyn website - not sure if they still make or sell it? Aquamira water purification tablets seem to be the same thing.
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 I used a system similar to the aquatap which was called 'Aquapure' bought from government health advice website, used by NATO i believe. It gave me fresh clean drinking water from some disgusting sources whilst trekking across the Pyrenees.
I still used purification tablets on water from clear fast flowing sources at which I would then use for cooking and drinking. But I found for lightening the weight the Aquapure water bottle was great. I would fill at a source and sip as I went along, then when I can to a new source I would finish the bottle no matter if I was thirsty or not and re-fill. It is now the first piece of kit I put in my pack. Although I am tempted by the lighter Sterpen system which is worth a look.
These systems are just easier than most chemicals, although its always good to have tablets as a back up.
hope that helps a bit
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 I've just returned from 3 months away in Nepal and India and I used both the Drinksafe Travel tap system and different chemical treatments (Iodine, Chlorine and the new Chlorine Dioxide!)
The Drinksafe filter is great. I can think of nothing easier than to just fill up from any tap and drink straight away. While other people in my trekking group were worrying about filling up then having to leave the water to purify for ages (using iodine in cold water could take up to two hours to kill giardia???) I was glad I had instant pure water. Its not just useful for drinking but for teeth cleaning and we also used it for flushing out a wound. Sometimes I even used the filter for removing the taste from water that I had purified with iodine!
I found that with chemical treatments the iodine tablets (which you can no longer get in the UK but we could get them in Nepal) are much more practical than the new Chlorine Dioxide combo drops. It's a fiddly and time consuming process to have to mix the two chemicals for ten minutes before putting them in the water and waiting a further ten minutes for them to purify.
After all this though, I have returned to the uk with what I think is a parasite in my gut. The symptoms point towards giardia, im just waiting for a doctors appointment!
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 I contracted amoebic dysentry when I was in Pakistan years ago - it's a fond memory....
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 I've got a drinksafe travel tap (from Backpacking light). Hardly instant though, I decant it first because I don't like the slow dribble. Great sytem though for streams in the wild; highly recommended.
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 ... The Drinksafe filter is great ... I was glad I had instant pure water ... After all this though, I have returned to the uk with what I think is a parasite in my gut. The symptoms point towards giardia, im just waiting for a doctors appointment! There's an obvious contradiction here surely? If the water was "pure" then you wouldn't be waiting to see the doctor with a possible gut parasite?
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Well that's what concerns me. I can't blame Drinksafe for that nor can I say that it definitely wasn't due to a fault in the filter.
The two people I travelled with in India are also showing the same symptoms as me and both of them drank only bottled water for the two months we were there. We did however eat pretty much the same things so I'd suggest that we were at the mercy of the kitchen staff...
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I think that was what got me to TBH - food - difficult to guard against unless you take those excellent Outdoorsgrub products and live on them  We used iodine in all water for the entire month we were there. Bottled water is not a guarantee from my experience - it might well be 're-bottled water' - check the seals and fit of the cap...
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Always difficult when you're not cooking your own grub, as you can't be sure part of your dinner hasn't been quickly and inadequately warmed up, for example (but hard to do other than use the locally provided food when trekking of course). Hope the news from the doc isn't too drastic!
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 > If the water was "pure" then you wouldn't be waiting to see the doctor with a possible gut parasite? Plenty of 'disease vectors' other than water, of course...
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I shook a fair few hands and stroked many dogs/cows/goats/yak...
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 paws and hoofs - not hands...
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