The charcoal filter adds minerals to your tap water, removes chlorine and absorbs unpleasant tastes and smells. It is ready to use once opened, just put it in the bottle.
The effects start after one hour in the water and are in full effect in 8 hours.
Your tap water tastes better and is healthier!
One charcoal will last 6 months, it is recommended to clean it in boiling water after 3 months.