For each cast, 8 pumps are evenly spaced and attached to the wire. Once all pumps are in position and lowered down to the proper depth a trigger is released to begin pumping. The pumps will sit at a stationary depth for four hours passing anywhere from 600 – 1500 liters of seawater through two separate filters. The filters are then processed inside the main lab “bubble” and divided into smaller sections for different groups to analyze (including team mercury!).