Biosand Filter Effectiveness and Components

The video tutorial explains the importance of having a good water filtration system, especially in crisis situations. It demonstrates how to construct a biosand filter using three layers: charcoal, sand, and gravel. Each layer serves a specific purpose in filtering out harmful substances. The tutorial concludes with a demonstration of testing the filter with unclean water, highlighting its effectiveness in improving water quality.

Why is it important to have a good water filtration system?

• To increase water pressure

• To improve the taste of water

• To ensure water is free from harmful substances

• To make water colder

What is the primary purpose of a biosand filter?

• To trap harmful substances in its layers

• To change the color of the water

• To add minerals to water

• To heat the water

Which material is used as the first layer in a biosand filter?

• Charcoal

• Gravel

• Cotton

• Sand

What role does sand play in the biosand filter?

• It heats the water

• It changes the water's color

• It traps bacteria as water percolates through it

• It adds flavor to the water

What is the purpose of the gravel layer in the biosand filter?

• To filter out bacteria

• To cool the water

• To stop heavy particles like leaves and sticks

• To add minerals to the water

What is the final step in assembling the biosand filter?

• Placing the final layer of gravel

• Adding more water

• Removing the charcoal

• Heating the filter

What is a potential limitation of the biosand filter?

• It makes water taste bad

• It may not remove all bacteria, relying on the immune system

• It is too expensive to make

• It cannot filter out any bacteria

How effective is the biosand filter in a crisis situation?

• It can keep you alive by filtering harmful substances

• It is only effective in urban areas

• It is not effective at all

• It only works with clean water