Review on WS02 Water Filter Straw - Versatile 0.1 Micron 4-Stage Water Purifier Survival Gear | Portable Filtration Straw for Hiking, Camping, Emergency Preparedness, and Outdoor Activities in Groups by Joseph Scalea

Put it in a 6 liter bag and see how fast it works. Even better is an empty Dassani water bottle or an empty 2 liter bottle. Just cut off the bottom of the bottles, screw on the filters, fill up - yes, it's that simple. Fills up anything you want in no time, even your RV/Camper tank. In addition, it can be quickly disassembled for cleaning, which you need to do from time to time. On average, there is a backflow every 3 liters or so. Anyway, full clean, not sure, ran well over 400 liters before I cleaned it. Yes, it gets dirty, but it's a filter.