Updated with the addition of a replaceable activated carbon element, the latest generation of BeFree filter bottles now make your water safe and 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. Features BeFree™ 0.1 micron microfilter removes harmful bacteria and cysts – lasts up to 1000L depending on water quality Activated carbon filter removes bad tastes from natural water sources and chemical tastes from less than stellar tap water – lasts up to 200L depending on water quality 2-stage filtration works in the city or the backcountry Filter has a fast flow rate and is easy to clean without back-flushing or special tools Double-layer thermoplastic polyurethane is durable, packable, and easy to clean Bottle capacity is 500ml Flip cap keeps the drinking surface clean BPA and PVC free Meets or exceeds FDA and EU regulations Do not allow the cartridge to freeze after initial use Specs Weight: 72g (Slate Blue) Ideal for: Backpacking, Travel, Day hiking Filter type: Hollow fibre technology, Activated charcoal Filter size: 0.1microns Cartridge life: 1000L Output 2L/min Dimensions: 27.3 x 8.5cm Effective against viruses: No Effective against particulate: Yes Effective against protozoa: Yes Effective against bacteria: Yes Made in Switzerland