Carbonation stones, typically an accessory found on brite beer fermentation tanks, are designed to be directly mounted via a Tri Clamp fitting. Each carbonation stone, made from sintered stainless steel SS316, is a submersible porous body that diffuses CO2 gas directly into brewing liquid. In an ideal system, the stone is mounted on the lowest part of the brite tank providing for the longest distance for CO2 to travel to the head. Some brewers use a carbonating stone inside a conical fermenter (or Uni Tank), rather than a brite tank.
Carbonation stones are a fantastic tool to aerate wort. Keeping yeast at optimum health is acheived when the oxygen-deprived wort is aerated following the knock down process (usually inline immediately after exiting the chiller). This helps the yeast not only reproduce efficiently, but also maintain a healthy cell wall that is more tolerant to higher alcohol contents. This allows for several generations of yeast, and more importantly, can reduce fermentation time substantially resulting in faster batch turnover.
All Tri Clamp carbonation stones have the following features: