Cheap and Easy Gravity Water Filter

Step 4: The Drink

Fill the funnel with water, and put it over your bottle. It drips slowly, but take a deep breath...

Now you’re ready to drink, or to treat your water more thorougly with chemicals or UV. If the water is very dirty, you can cover the input end of the filter with a coffee filter and a rubber band, in which case the flow rate will probably be reduce.

If you don't want the filter to stand deep in the bottle (like on the picture above), you could make a stand out of a smaller soda bottle. Cut the bottom and the neck to make a tube, and put it between the Nalgen and the funnel.

Also, one could attach some wire on the funnel, so you can suspend the filter above your container.

Comments

[jke]

I like it but I am afraid this only works with non-turbid water, right?

[hackersmith]

I can vouch for the bandana method. You could put that over the top of the 2 liter opening to get the floties and some of the mud out. The coffee filter could be a stage 2 and the straw filter part 3.

We did it with some stream water when we filled up a pump style filter. We bandana screened the particulate out then the pump would do 3 microns. We chemed it after pumping just to comply with the camping regulations but it probably wasn't necessary.

[jsawyer]

Brilliant! Nice KISS pre-filter.

RE: Turbid water: He recommended using a paper coffee filter. You could also stuff a bandana, strip of cotton cloth, or whatever in the funnel to reduce the solids before it gets to the filter.