Movie: Return to the creek (1.8M)
Movie: Dud except for still (499K)
Movie: Garry: Right on 3 ppm (434K)*
Movie: Gretchen: Test bottle A and bottle B (5.2M)*
Movie: Gretchen shaking dissolved oxygen to purple (3 ppm reading) (14M)*
Movie: Gretchen testing (1.4M)*
Movie: Girls collecting water (501K)
Movie: Gretchen collecting water (3.5M)
Movie: Within 10% (5.8M)
Movie: Where you get your reading from (944K)*
Movie: Dud (702K)
Movie: Get the right groove on (1.7M)*
Movie: No air bubbles in the pipette! (1.2M)*
Movie: Take your pipette out (3.5M)*
Movie: 8 drops to purple (3.9M)*
Movie: Set it down on the level at 20 (2.3M)*
Movie: Cap your old bottle (6.6M)
Movie: Rotate with the wrist (3.4M)*
Movie: Shake it all around and wear old clothes (7.3M)
Movie: pH color matching (1.2M)
Movie: Want 3 to 6.5 pH (1.8M)
Movie: pH sampling in Drexel Park with spectators (10M)
Movie: Separating sediment (968K)-
Movie: Clean streams to attract business (2.1M)
Movie: Conductivity meter (6.0M)
