TEAM+D

Our experiment to filtering bacteria filled pond water.


 * Hypothesis** : If I filter the pond water using a coffee filter, charcoal, and hydroxide, then the filtered pond water will decrease its number of bacteria.

Why do you think it works: Coffee filter trapped all of the large particles. The charcoal killed the bacteria. [|charcoal] Using the [|hydrogen peroxide] killed bacteria, viruses, and fungi. Procedure:

First step - fill the pond water to 30 ml into the gradulated cylinder. The picture below shows a graduated cylinder.

Second step - Filtered the pond water with a coffee filter to remove the large particles. Just pour the water into the filter and watched it separate the particles - Below is a picture of a beaker and a funnel covered in a coffee filter.

Third step - Take 3 tablespoons of charcoal and put it into the beaker with the coffee filter in the funnel. Then take the filtered the pond water through that. Below is a picture of charcoal in the funnel being filtered.

Fourth step - Now take two drops of hydrogen peroxide and put it into the pond water. Below is a picture of a droplet letting go of hydrogen peroxide into the pond water.

Procedure is official over at this point.

Take a droplet and drop 3 dots onto the agar This picture below is the pond water that was filtered. We took the original pond water and put it into a different agar to help grow the bacteria Filtered Pond water

After 3 day incubation: These are our final results ! The first picture is the filtered pond water- This picture above is the filtered pond water. its not as clear as it was originally, but its oblivious that there's less bacteria then when we started.

This is our original unfiltered pond water - Clearly the pond water we started with had bacteria.