Free: Contests & Raffles.
I've used a hyperflow. My friend brought one on a four day trip. It took forever to pump so he took it back to REI. I think it was faulty because I've heard others say they didn't have any problems and it filled up their reservoirs really fast. So I'm pretty sure this one was just faulty. My thought is, for the same weight, why not use a gravity filter and not have to pump at all?
I seldom pump more than a liter at a time. Two when I know I'm settling in for camp/dinner. I never want to carry four liters anywhere. -Steve
Try micropur tablets. They don't taste as bad as iodine. Iodine tablets are also not meant for long-term use. They were meant for emergency purification. CO2 tablets/liquid is the same stuff purifying domestic tap water.