Gravity Water Filter Straw 3L, Camping Water Filtration System with Purifier, Water Purifier Survival for Travel,Camping,Hiking and Emergency Survival Kit (Gravity Water Filter /1)

Good flow rate and easier to clean. A few minor issues.
I’ve used a number of gravity water filtration systems while backpacking. This one uses a perforated plastic ‘shell’ around the ultrafiltration membrane which allows the water to enter from all around the cartridge, rather than just from the end as with most other filter cartridges. The cartridge resides within the water bag rather than outside of it as is more common. These features, when combined with the lack of an activated carbon filter (to remove bad tastes) results in a fairly high flow-rate. Better than most similar systems. The other potential advantage of this ‘open’ filter cartridge is that you can just shake the water bag with the filter in place and some water in it to dislodge dirt and other contaminants, rather than needing a syringe, adapter, etc. to ‘backflush’ the cartridge to clean it out and restore flow, as most others require. The manufacturer claims a lifespan of up to 1000 gallons filtered, which is very good. As with all membrane filters, it should never be allowed to freeze while there is still even a tiny bit of water inside, as this will burst the tiny microtubes and ruin the filter.Things that I wish were a bit different are as follows:-I’d like the reservoir bag to be larger, perhaps 5L instead of 3, as I like to carry a full bag back to camp from my water source, and have enough water to filter for dinner that night, breakfast the following morning (mostly just coffee), and for the hike the next day until reaching the next water source.-The roll-top closure of the bag is quite stiff and hard to bend to get the buckle to close. The buckle is also quite unnecessarily large. Both could be slimmed down to save weight.-The hanging strap is nicely made of thin webbing, but the length is too short to get around many tree trunks, or allow you to adjust the height of the hang to better reach your receiving bottles. I’d like the strap to be about a foot longer.-Depending on where you are getting your water to filter, the lack of an activated carbon filter within the unit could affect the taste of the water (but does improve the flow rate).-The filter protrudes about 4″ into the water reservoir bag. As you get to the bottom of the bag while filtering and the water level drops below the end of the filter, you will get progressively more air and less water coming out the tube, and the water flow rate will drop significantly.

Good for camping
Works well, good for camping

Nice affordable gravity filter
This is a great gravity filter for occasional outings or for emergencies. We recently spent several days canoeing and carried a pump filter, and I loved being able to refill my water bottle whenever I wanted, but when I tried someone else’s gravity filter, I loved how easy it was to get a campsite sized amount of water.This unit has a filter rated for 1000L of water, which is plenty. Unlike a lot of filters, which have cleaning kits, you clean this one by just shaking it up, and it has a nice flow, so it’s easy to get 3L of creek or river water, then hang up this kit and let it do the work for you. As some other people have mentioned, the strap is a little short, so you may want an extra cinch strap or cord for trickier situations.A hand pump is probably a little faster for small amounts, and an activated carbon filter might get you a little better taste, but this gets you clean safe water at good rates, and is at a good price point.