Ja, du er nok bekymret for reinhetsloven
Men det er greit innenfor dersom du justerer pH med surmalt/sauermalt
The use of Sauermalz is an elegant way of complying with the German purity law (Reinheitsgebot) since its lactic acid has been produced by lactic acid bacteria that are naturally occurring on the surface of the malt. Because of that the mash pH can be corrected and the beer can still be brewed with just water, malt, hops and yeast. Some German brewers believe that if this loophole would not have been found the German purity law would have needed to be amended since the benefits to beer quality attained from being able to acidify the mash are substantial.