Aquaculture 1x7 galvanized steel strand, 6mm to 10mm, for longline and grid mooring work that sits in seawater year round. Sea farmers are hard on steel. A longline runs from a shore anchor out across a bay, holds crop and current load, and sits in salt water, silt and biofouling for years. Galvanized strand survives this better than most people expect, but only if the coating is heavy enough and the water is not strongly anaerobic. In sulphate rich mud, steel can suffer