 A project has been underway in Kings Bay (Crystal River) since 2012 to use water hyacinth and water lettuce to improve the water quality and reduce algae growth.Even though water hyacinth is an exotic plant and has been a problem in the past, they have re-introduced them in PVC corrals where the hyacinth would filter out the toxins and kill off phytoplankton algae that are making the water green.The PVC corrals are necessary due to the fact that manatees love to graze on this aquatic plant.