Bought this to replace the Web Tex version of the same ive owned for a year or two. The filter inside the bottle snapped/broke on the Web Tex whilst I was carrying it around in a rucksack one day and you cant buy a replacement with their version. Don think this could happen on the Explorer Pure, its got a nice strong plastic guard around the actual filter inside the bottle which will protect it very well from knocks and bangs and squeezes I should imagine, and you can buy a replacement filter with the Explorer Pure, you just unscrew the old one and fit the new, you couldnt do that with the Web Tex bottle I previously owned you had to buy a complete new product/bottle, (so much better). Pricewise this bottle cost a bit more than the Web Tex version, about £8.00 more, but considering what ive already mentioned above, and the fact that you get a good fabric holder/sheath and belt with the Explorer Pure, I think paying the bit extra is really worth while. Havent really tried the bottle out in earnest yet, only the once, filtered some pond water for a brew, and used it to filter some tap water on several occasions and it performed well, no tummy upsets etc etc, so far so good. Only one little gripe, like with all of these water filter type canteen bottles, you have to apply considerable pressure to squeeze the water through the filter and after a few minutes the muscles in the fingers and hands and arms start to ache, quite badly, but once again its the same with all these type water filter bottles.
All in all a good product, I give it four or four and a half stars out of five, recommended.