Since the removal of forests 150 years ago and ongoing intensive land use, sediment has been going into the gulf. We look at how councils manage land development and some great new initiatives to help remove sediment with tree planting. We explore Auckland’s 100 year old sewerage system and why it’s not possible to swim at beaches after heavy rain. We check in on the Central Interceptor upgrade and investigate great new plans for mussel restoration in Okahu Bay.