Why We Chose The MSR AutoFlow XL Gravity Filter 10L: innovative, effective, packable.
When you’re thinking about drinking water straight from the source you should always be considerate of its cleanliness. Some people will choose to take the risk and drink without purification or filtration, but it’s certainly more advisable to take precautions. You should never rely on the apparent clarity of the water – viruses, bacteria and dissolved metals will almost always be invisible to the naked eye.
“You should never rely on the apparent clarity of the water – viruses, bacteria and dissolved metals will almost always be invisible to the naked eye.”
Of course boiling is the number one way to filter out water, but sometimes fuel is on limited supply when overnighting, not to mention that it also takes a long time to boil even just a couple of litres of water. And this is where water filters like this come in.
The AutoFlow XL filter from MSR cleverly utilises gravity to filter out bad stuff from your water source. Using a 10-litre reservoir that’s hung from, say, a branch or fence post, it’s large enough to supply water for two people for an entire day.
The secret is in its hollow fibre technology. This involves a bundle of spaghetti-like straws, each dotted with microscopic holes that are big enough for water molecules to pass through but too small for nasty things like bacteria, protozoa and dirt.
Simply with the use of gravity, water will flow and filter through these at the rate of 1.75 litres per minute. Granted, that’s slower than what’s offered by most pump-actioned filters, however this has the benefit of being lighter, more packable, and capable of storing and carrying water. It’s built rugged too, using a tough PU film bladder with RF welded seams and smooth, rounded edges.