In the first step, the heavier waste in the water (called "sludge") is allowed to sink to the bottom. The sludge is removed, leaving only the cleaner water.
Next, the water flows through a mesh screen, which removes dirt and dust.
Now the water has no more solid waste. But it still isn't clean. The water has dangerous microorganisms, like bacteria, living in it. These microorganisms could make you sick if you tried to drink the water. To remove bacteria, we need to use a little bit of science know as "microbiology." Let's see what happens!
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