Step 2: How to Use Your Gravity Filter
1. Put filter in a pot of water above the bottle.
2. To start the flow of water, there must not be air in the hose, so suck water into the hose with your mouth
3. Place end of hose into water container.
Once the flow has started it will continue until the pot is empty. To filter more than one pots worth of water, simply add more water before the pot is empty and air enters the hose.
Tips for use:
Remember that your pot has touched unfiltered water, so be sure to heat something all the way to a boil before you eat from it!
This technique takes a bit longer than pumping, so its often most convenient to do in camp while doing other things like preping dinner.
To make the water move through the filter faster, increase the vertical distance between the filter and the bottle.
Even if you don't use this technique regularly, remember it in case your pump breaks- it has happened to me before!