BeFree 1.0L Double-Layer Water Filtration System | KatadynUpdated with the addition of a replaceable activated carbon element, a redesigned cap, and an updated bottle top, the latest generation of BeFree filter bottles are more durable and make your water taste better. Simply squeeze the BeFree Microfilter to get clean water to drink, and give it a shake or a swish to clean out the filter. When it's empty, it collapses to free up space in your pack. BeFree 0. 1 micron microfilter removes harmful bacteria and