It filters the water good and the filter is easy to clean but it takes superman strengh to work it. My girl could not even use it and when she pumped .5 L she was so tired and drank the water she pumped. I am pretty strong and it takes me about 5min per liter to filter. When I have to pump 4 liters I needed to take brakes and would take me 40 min to pump 4 liters. I will not ever take this filter with me backpacking again unless its just me and only me. Even then I prob would not take it. I cant waste that much time and energy getting water. Over one day I spent 2 hours pumping and that is too long. Buy if you want but I warned you. Im going to try the msr autoflow gravity filter.