ArticleKräusen Rings & Shelf Stability: Mr. Wizard Q Does the dried-up kräusen ring at the top of my fermenter after primary fermentation present a bacterial contamination risk? Daryle Sewell Frankfurt, Germany A Fermenting beer can at times appear unusualAlready a member? Log InWritten by Ashton LewisYou'll Also Like Article FREE Terminal Gravity Woes, Hot-Side Aeration and Adding Water to a Boil What to do when your fermentation stalls out well above your expectations? Mr. Wizard offers some advice on the topic as well as troubleshooting an off-flavor issue and wort volume problems. Article FREE Feeling the Pressure, Tips for Unitank Users Mr. Wizard dives deep into the effects changing pressure can have on carbonation levels of beer. Also, a homebrewer is looking for advice on best-practices for the new unitank they recently purchased.