Book 30, Question 117 · Video
What can't a filter remove from water?
Filters are good at catching things bigger than their tiny holes, but dissolved substances can slip through, like salt, some chemicals, and some minerals. Different filters do different jobs, so no single filter fixes everything. That is why water is tested, and why treatment plants combine several steps. If you're unsure, ask a grown-up and read the label of a filter.
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What Crafty Clover says in this video
Intro
Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. What can't a filter remove from water?
The Big Idea
Filters catch lots of things! But not everything. What slips through?
What Filters Catch
Step one: What Filters Catch. Filters are good at catching things bigger than their tiny holes. Dirt, sand, and many germs get stopped.
What Slips Through
Step two: What Slips Through. Dissolved substances can slip right through, like salt, some chemicals, and some minerals. They're mixed into the water so completely that there's nothing to catch.
Many Steps
Step three: Many Steps. Different filters do different jobs, so no single filter fixes everything. That's why water is tested and treatment plants combine several steps, so read a filter's label and ask a grown-up.
A Closer Look
Let's take a closer look! Caught. Many caught. Slips through. Some slip.
Quick Facts
Quick facts! Dissolved salt is invisible but changes how water tastes. Filters catch big bits. Plants use many steps. Read the label.
Think Like a Scientist
Now, think like a scientist! Stir salt into a cup of water. Pour it through a coffee filter. Put a few spoonfuls of the filtered water on a plate. Let it dry for a few days. Is there salt left behind?
Outro
Filters catch things bigger than their tiny holes, like dirt and many germs, but dissolved substances like salt, some chemicals, and minerals slip through. No single filter fixes everything, so water is tested and treatment plants combine several steps. Science is amazing! Keep wondering and keep exploring! Share what you learned with someone at home, and see what they think! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!