I am not sure where and how some of the reviewers used this filter, or why they are writing such negative reviews. I have been hiking and using filters now for 15+ years (Katadyn, Sweetwater - and they also work fine, but slower). Just used this one again on 7 day trip up north (Fort Nelson area)for group of 3. Water was mostly from creeks of various clarity. No problem with the float end at all, actually it works great! We had 3 filters, but after the first use we only use HyperFlow. My partners wanted to buy it from me right there! Easy to use, very light, fastest flow by far when compared to anything comparable. All filters plug up and slow down in silty water, so what? It is so easy to back flush (best to do right after watering up and it takes me about one minute). True, I have not use it to try to pump water from a puddle so far, but I had only do it once in last 10 years. I am sure it can be done, but it may take a little longer to get your 4-6 liters done. For now I say if you like lite and fast, buy it, you'll love it! Excellent gear!