Wyeast Czech Pilsner Lager, 125 ml XL Wyeast Czech Pilsner Lager, 125 ml XL WYXL2278 Used by many German breweries to produce rich, full- bodied, malty beers. Flocculation- medium; apparent attenuation- 73- 77% (Best Fermentation temp. 48- 58 �F). 125 ml. Activator pouch with 100 billion yeast cells. Related Products Product Reviews