The Hydrostones couldn't be easier to use. Basically soak the Gecko Hydro stone in clean water for a few minutes. This allows the porous terracotta to absorb moisture then place in your tobacco pouch/container. The cold damp stone will keep the tobacco fresh without over soaking the tobacco.
The stone should keep even additive free tobacco's fresh for weeks or even months in a sealed container. In a pouch that is regularly opened we would recommend re-soaking the stone every couple of days.