Question

D. HOTS
sizes of gravel and charcoal
a. What is the reason for using different sized gravel?
b. Their teacher had told them that filtered water looks clean but it is not fit for drinking
Explain the reason.
c. What should they do to make this water fit for drinking?
A group of students residing in a rural area have made a homemade water filter, using differ​

Answer 1

Answer:

• Layers of gravel can trap large particles and help to oxygenate the water. If there are smaller gravel below, they will filter out smaller particles. Then there's pea size gravel which would continue the process and then perhaps sand.
• No matter which water filtering system you choose, you need to maintain it; otherwise, contaminants build up in the filter and make the water quality worse than it would be without the filter. It's important to know that a home water filter won't protect you from water that has been declared unsafe.
• If you don't have safe bottled water, you should boil your water to make it safe to drink. Boiling is the surest method to kill disease-causing organisms, including viruses, bacteria, and parasites.