sentences:  During the design phase, kelp scientists Wheeler North at the California Institute of Technology and Mike Neushal at the University of California, Santa Barbara informed the aquarium of the kelp's needs.The exhibit's success at sustaining giant kelp and its realistic appearance are attributed to the availability of direct sunlight, the use of natural seawater from Monterey Bay, and a surge machine (a large plunger) that replicates California's pulsing water currents.The surge machine, which plunges every 6 seconds, allows the kelp in the exhibit to grow an average of per day and was designed and constructed by David Packard.