How does that work for e.g. small scale salt farming in many European countries that flood areas with sea water, then harvest the salt after the water has evapo

How does that work for e.g. small scale salt farming in many European countries that flood areas with sea water, then harvest the salt after the water has evaporated [0]? Is it just a case of the scale making it safe? 0: https://www.timeout.com/croatia/things-to-do/ston-salt-works https://www.timeout.com/croatia/things-to-do/ston-salt-works