Magnification: X 5,000
Diatoms are tiny single celled plants that live inside a hard shell. They occur in great quantities both in salt and fresh water. When the plant dies, the shell sinks to the bottom. Over time, large quantities of these shells accumulate. They can be collected and used as diatomaceous earth in swimming pool filters. The shells allow water to pass through but trap any small dirt particles.
Science Learning Network Home / SLN Inquiry Resources / © 1996 Museum of Science, Boston