Last summer, I went on a trip to Haiti that changed my life in many ways: one of them was giving me a passion for providing water to the developing world.
Last month, I went on a cruise to Bermuda (my parents made me, I swear!), which didn't change my life at all...but at least it gave me an idea.
In Bermuda, the only source of fresh water is rainfall, so all the roofs are designed to collect the water that falls on them and feed it into a tank. Our guide explained to us that, traditionally, the white roofs are coated with lime-wash, which apparently purifies the water.
An old post on this site mentioned that lime does this because it absorbs carbon dioxide, which then undergoes a chemical reaction that produces water. Now, I am a high school sophomore, so although I'm pretty sure I have the gist of it, I'd love to hear any other input from you guys, who seem pretty experienced in these matters.
Thanks for being so nice to the newbie!