Step 2: cut the bottom off the cup!

cut the bottom off the plastic cup with the scissors. you should now be able to see through the cup like it is a tube.
Is rainwater that unclean where you really need to filter it? Only pure water can evaporate, and unless you are in the middle of a city full of smog, I'm not sure the rain would be dirty enough to justify a filter.
<p>hey i can really use this thx</p>
Why not use activated carbon?
i am only 13 and dont know what active carbon is but i guess it would work
It's <a href="https://en.wikipedia.org/wiki/Activated_carbon" rel="nofollow">carbon 14</a> from plants and animals ground up really fine. It binds almost everything and is often used for filtering but it wouldn't have killed off bacteria so you did it right. Good article and explanation. I like the whole gravity filter approach.<br>
thanks for the explanation <br>as i said i am only 13 so didn't knw about carbon 14 <br> <br>pls vote for me in the green tech challenge <br>
Activated carbon won't kill bacteria.
pls vote for me in the green tech challeng
Great idea! I just wonder if the water would stay in the purification reservoir long enough for the tablets to do their job. Great start, though.
pls vote for me in the green tech challenge

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