The rapid heating and cooling during the carbonisation, or Pyrolysis, process, and the resulting enlargement of the hardwood’s millions of internal pores, is what enables KURO-Bō Activated Charcoal to adsorb certain contaminants, such as heavy metals:
- At a microscopic level, it attracts the positively-charged toxins and metals (Mercury and Lead, for example) which bind fast to the vast surface area, thereby removing the harmful elements from the water
- Adsorption is what makes ordinary, municipal-treated tap water taste clean, sweet and delicious
- A single gram of activated charcoal can have a surface area of up to 1500m2 – essentially 6 times the surface area of a tennis court – which is why it can so efficiently adsorb as many toxins as it does!
- Each KURO-Bō Stick or pack of Kōins reaches a saturation point after about 3-6 months of daily use, when the pore surface area is effectively covered with impurities and a fresh piece of charcoal is required.
Activated carbon and chlorine
Activated carbon can remove and destroy residual disinfectants (chlorine and chloramine) through a catalytic reduction reaction. This is a chemical reaction that involves a transfer of electrons from the activated carbon surface to the residual disinfectant. In other words, activated carbon acts as a reducing agent.
Its removal of chlorine reduces the chlorine to a non-oxidative chloride ion. Chloramine removal by activated carbon is a much slower reaction. The predominant species of chloramine in city water supplies (pH about 7 to 8) is monochloramine. The reaction with activated carbon and monochloramine also renders a non-oxidative chloride ion.