KATADYN Water Purifier BeFree Gravity Water Filtration System 3.0L

Capacity is 3.0 liters. The manufacturer's specifications list use by 2–5 people, and the product description lists family camping and group activities, at up to 2 L per minute.

Fill it with water and hang it up; it filters by gravity, with no hand pumping. A built-in flow control valve adjusts the output. It comes with a soft hose, shoulder strap and storage bag, and the wide opening makes filling easy.

The product description does not list viruses. The listed targets are bacteria, protozoa, cysts, sediment and microplastics, with a 0.1 micron filtration pore size. It should not be relied on for virus protection; if virus contamination is a concern, the water needs separate treatment.

The cartridge is a 0.1 micron hollow fiber membrane, and the product description lists removal of bacteria, protozoa, cysts, sediment and microplastics. The manufacturer's specifications list the water source type as clear water.

The specification lists a cartridge life of about 1,000 liters, depending on source water quality. When the flow rate drops noticeably, first clean the cartridge: fill the pouch with water, reattach the cartridge and shake it vigorously, or hold the cartridge and swish it in water to clean it; untreated source water can be used. However, the outlet (mouthpiece) must not touch untreated water; keep it clean after cleaning. Hold the pouch end lightly while swishing — do not squeeze the filter itself.

Fill the pouch with water, reattach the cartridge and shake it vigorously, or hold the cartridge and swish it in water to clean it; untreated source water can be used. However, the outlet (mouthpiece) must not touch untreated water; keep it clean after cleaning. Hold the pouch end lightly while swishing — do not squeeze the filter itself. Do not rinse it horizontally under tap water, squeeze it by hand, or touch the hollow fiber membrane with tools or fingers.

Capacities are 3, 6 and 10 liters, weighing about 192, 263 and 284 g. The cartridge is the same 0.1 micron, with a life of about 1,000 liters. The product descriptions for the 6L and 10L also list an adapter kit and a transparent graduated window.

Not recommended. The product description lists bacteria, protozoa, cysts, sediment and microplastics as removal targets. Salt is not listed, so do not use it for seawater desalination.

No. The manufacturer's manual warns against using it in freezing conditions, because a frozen membrane could let microorganisms bypass the filter and cause illness. If the cartridge has frozen, been dropped hard or may be damaged, stop using it and run the manual's integrity test: with the membrane wet, try to blow air through the output hose; if you cannot blow through, the fibers are intact, and if you can, the fibers are broken, so stop using it and replace the cartridge.

Before long-term storage, follow the long-term storage procedure in the manufacturer's manual: clean and disinfect the filter, hoses and bag, then disassemble all parts, rinse them with filtered or treated water, air dry them completely, reassemble and store them in the carry bag; the manual has the detailed steps. When taking it out of long-term storage, flush it with 2 liters of filtered or treated water to remove stale taste. Do not put the membrane or filter cap in a dishwasher or microwave; the flask can go on the top rack of a dishwasher.

The manufacturer's manual states that the BeFree does not remove viruses, nor chemicals, radioactive materials or particles smaller than 0.1 microns, and that it must never be used on seawater, brackish water or chemically contaminated water (for example water from mine tailing ponds or near large agricultural operations). If the water raises these concerns, use a reliable drinking water source instead, or treat it separately.

Yes. The manufacturer's accessories include quick connects that let you attach the output hose to a hydration bladder or another container; the outlet hose has a quick-release valve that closes automatically when removed, so the hose does not touch dirty water during refilling. The manual advises not to drink directly from the output hose.