Brewers in Düsseldorf made use of the pale malts that were used for the modern pale lagers, but retained the previous ("alt") method of working with warm fermenting yeasts. The primary brewery to make use of the identify Alt was Schumacher which opened in 1838. It's really a simple fact https://fed21027269.ampedpages.com/the-smart-trick-of-cci-srp-primers-that-nobody-is-discussing-46884455