KURO-Bō Activated Charcoal has undergone rigorous scientific testing*


Just four simple steps, identical for both KURO-Bō Sticks and Kōins, will transform your toxin-trapped tap water into pure, toxin-free, pH balanced, mineral-rich water – described by one little fan as ‘loving water’!

These tests have reaffirmed KURO-Bō's successful capacity for:

  • toxin, chemical and bacterial adsorption and removal from contaminated water
  • balancing an acidic pH of spiked water
  • enriching tap water with beneficial essential minerals

*Performed by A.L. Abbot & Associates, SANAS-accredited specialists in Water Treatment – Reg. No. 82/04379/07


The rapid heating and cooling of the carbonisation process, and the resulting enlargement of the hardwood’s million’s internal pores, is what enables the KURO-Bō Activated Charcoal to adsorb toxins:

  • At a microscopic level, it attracts the positively-charged toxins and metals (chlorine, mercury and lead, for example) and then attaches those toxins onto itself, thereby removing the harmful elements from the water
  • Adsorption is what makes ordinary, municipal-treated tap water taste so much cleaner, sweeter and more 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 at about 3-6 months of daily use.


  • Boiling your KURO-Bō once a month keeps the pores open and the surface area maximised for optimal toxin adsorption.
  • The boiling of the charcoal does not “clean” the charcoal, nor does it release any adsorbed toxins and impurities back into the water - this has been laboratory verified.
  • As the KURO-Bō moves beyond 3 months, you may need to reboil it every 2-3 weeks in order to optimise the longevity of the charcoal. 
  • Occasionally, Activated Charcoal Water Filter Sticks can fracture during any of the reactivation stages a result of expansion and contraction of air in the pores during the heating and cooling process. This in no way affects the efficacy or life-span of the Filter; it simply changes the appearance.