Prior to the start of the boil add to the bottom of your still's boiler. These ceramic boil enhancers aid in even heating during the boiling process. The ceramic boil enhancers break up potentially large bubbles that could encourage surge boiling, puking, or boilovers from your still.
Package of 10, enough for small and medium boilers, 1 gallon to 8 gallons (4-30 liters).