This past unit was called 4.5 billion, and taught us the importance of water and its chemical properties. We went on a field experience last week to the water purification plant down by Navy Pier. There we learned more about water and how the plant filters it so it's drinkable. Our AP is to make our own homemade water filter. The big question that I came up with was: What can we do to filter water efficiently and cheaply, lowering its pH level? My hypothesis is that the water will run through my filter, and come out cleaner at the other end. The materials I used are; gravel, a plastic Coke bottle, a knife, activated charcoal, coffee filter, a large cup or mug, and a hammer and a nail. Most of these materials I was able to find around the house, but some of them I had to go out and buy, like the activated charcoal and the coffee filters. These are the steps I took to make my filter, and people could also use this to make their own filters out of the materials mentio...