Week Four (April 24th, 2018 - April 30th, 2018)

This week our group primarily focused on testing our different materials. For this class period, we decided to test the filtration capabilities of(cleaned) sand, charcoal, and the coffee filters. For each material, we performed at least three trial tests. However, we tested charcoal four times, based on the fact that the charcoal that we were using is very fine, so it required more testing to figure out the appropriate amount of charcoal for the filtration layers. In our testing, the controlled variable was the volume of water that we attempted to filter. The dependent variable was time, while the independent variable was the amount of the different substances that we decided to test our filtration techniques on. 

The dirty water actively being filtered by the charcoal

Stefan and Amy testing the sand

 Sample Data

Material	Time(min)	Weight (g)	Volume (mL)
Charcoal -T1	5:24	0.89	400
Charcoal - T2	8:31	1.12	400
Charcoal - T3	7:04	2	400
Charcoal - T4	12:40	3.81	400
Coffee Filter - T1	1:03	1.6	400
Coffee Filter - T2	2:00	3.2	400
Coffee Filter - T3	1:09	4.8	400
Sand - T1	9:45	122.4	400
Sand - T2	4:48	35.5	400
Sand - T3	12:53	61.1	400
* One Coffee Filter Paper weighs 0.80 g
* Throughout charcoal testing, coffee filter and a staple was used (weight was accounted for)

This is the data that we gained from all of our testings. Next week, we will be putting together a prototype and will be testing it against the organic solution and metal solution that our teacher has created for us.