Zeeland has quite a reputation for its mussels. They grow in two ways: suspended on hanging nets, or down on the tidal flats. Hanging is faster, and is used in the Oosterschelde estuary. The classical method on the flats also requires a dilution, or rinsing, period to remove much sand.
In this relatively new technique, suspended mussels collect no sand in the shell. They get more food and light, and develop more meat. It is, though, more labour intensive. The seed are hung on ropes in long stocking-like nets, and the mussels grow through them. Hanging accounts for just a few percentage points of all mussel cultivation.