Brine can be from industrial waste

Technically, brine just means a high concentration of salt in a fluid. It doesn’t necessarily have to be sodium chloride like we know, it can be other salts, like calcium chloride. Though the most common case for industrial brine is just desalination plants, other industries can still create brine, like mining/oil drilling. It also depends on how it’s released. Large amounts dumped at once is the reason for manmade brine pools.