What is the best water filter combination?

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My class is doing an experiment. We have a normal 500ml plastic bottle, with the bottom slightly cut off. We then have filtration materials such as pebbles(biggest but floats in water), gravel(second finest but is very powdery), and sand(finest). We each get a coffee filter paper along with some paperclips and rubber bands. We have to filter dirty lake water to clear, odourless water into a beaker. What is the best combo? And where should I apply the coffee filter paper? Thanks for your help!

What is the best water filter combination? image 1

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