Using a 15 gallon milkcan set up attached to a narrow thumper from brewhause , the thumper is filled about half way with same mash in the main vessel. Right at start up as the heat starts to I guess create pressure most of the contents of the thumper are expelled leaving it about 1/4 full .
‘’question is , is that enough for the thumper to do its job ? First time I’ve used it as there was an issue with quality and took time going back and forth across the ocean wide .