STAR SAN is a high foaming, acid anionic, no-rinse sanitizer. Don't fear the foam! This sanitizer is the most popular sanitation product for homebrewers of beer, wine, or any other DIY fermentation project because it sanitizes on contact - no need to wait 2 minutes like with other products like One Step or Saniclean. Highly concentrated - mix some STAR SAN concentrate with water, according to the ratio indicated on the bottle, to produce your properly diluted sanitizer solution.