Plastic Bottle: Activated Charcoal Water Filter

Overview: Activated charcoal can be made by using lemon juice, salt water or bleach to charcoal that can itself be made easily and freely. This opens the possibility of making effective water filtration systems, transforming lives without having to buy anything.  The Water must still be boiled before drinking

Task: You are to create an activated charcoal water filter 

Equipment Provided: Plastic Bottles, scissors, gravel, sand, water, cotton wool/ clean cloth, activated charcoal

Health and Safety: You must carry out your own risk assessment (Rubbish Science accept no liability)  Note: Be careful when cutting, wash hands after handling gravel and sand. The water must still be boiled/treated before drinking it

Things you might need to know / Questions you might ask:

  • What size bottles would be best?
  • What is the minimum amount of each material needed to be effective?
  • How can you make the flow rate as fast as possible?
  • Is it better to use the filtration gravel etc in separate bottles or build it in a single one?
  • Could you combine this with the SODIS method? ?

Prototyping: Try to answer the questions above using small scale experiments

Modifications:How might you modify your designs based on what your preliminary results look like? What have others done and what can you learn from them?

Prediction: What do you think will happen and why?

Do it: How are you going to see if your filter is successful?

What happened?: Was your filter effective?

Tell Someone: Explain what you did and why you felt your filter was effective. Listen to others do they have any good ideas?

What did you learn? What do you know now that you didn’t know before you started this investigation?

Extension/Modify/Do it again: How could you extend this to produce a commercial water filtration business

Possible Model – How can you optimise the design?