The pump-free GravityWorks 2.0L Complete Kit filters up to 1.5 liters a minute and is ideal for 2-4 people. The high-capacity GravityWorks 4.0L filters up to 1.75 liters a minute and is ideal for bigger groups or basecamps.

• No pumping: Just fill the dirty reservoir, hang it, and let gravity do the hard work-yep, filtering water can be as easy as fill, hang, relax.
• Effective: Every micro-filter is individually tested to ensure it meets all EPA & NSF guidelines for the removal of 99.9999% of bacteria and 99.9% of protozoa*.
• Light & Compact: 2.0L weighs 6.3oz (180g) and 4.0L weighs 11.5oz (326g). Both stow smaller than most 1L bottles.
• Field-cleanable: Micro-filter can be easily backflushed in 4 seconds to maintain filter performance.
• Hollow Fiber Advantage: Hundreds of tiny, hollow fibers, enable the micro-filter to filter water faster than traditional filter media.
• Easy collecting & dispensing: Collecting water is easy-simply open the top, scoop water, and close; control delivery of filtered water with hose shutoff clamp.

Includes: Clean reservoir, Dirty reservoir, Hollow fiber micro-filter, hoses, shutoff clamp, and storage sack.