Draught Beer At Home Why Does A Draught Beer Have An Extremely High Oxalate Level, While A Bottled Beer Has A Very Low Level?

Why does a draught beer have an extremely high oxalate level, while a bottled beer has a very low level? - draught beer at home

He was diagnosed with calcium oxalate, kidney stones and analysis of foods with high oxalate in this ... I can not imagine! This project promotes oxalate?