The River Adur & Salt

I recently went out to the River Adur to collect some water as the tide was at its height. The idea was to investigate the process of making salt from the brackish water once used by saltmakers at the various "salterns" that existed at certain places along the river. The last time this activity occurred was something like 600 to 900 years ago when the tidal action brought seawater up the river to the local flood plains. It didn't turn out quite the way I expected!