Each group of 4 will filter 3 different volumes of their water sample: 1 mL, 10 mL, and 100 mL. 1. Label the sidewalls of the 3 Petri dishes with your initials, lab section number, water sample source ...

This air purifier is a good fit if you need strong filtration for a large space. According to AHAM lab results, it has a very high CADR (especially for its price), meaning it can filter out air ...