Rusty charcoal after a week's use? No!
Hmmm... Charcoal shouldn't "rust." I boiled these koins/pieces as per the instructions. I placed 3 in my 17oz S'well bottle for travel. Over a week's time, I used the bottle & Kuro-Bo off/on. When not in use, I made sure the bottle was empty & tipped the bottle on its side so the charcoal could spread out & dry inside the opened bottle. On my trip home, I filled the bottle at an airport filling station; took a sip immediately & it tasted like iron. I thought it was an improper filter on the filling station, but didn't have time to empty & fill elsewhere, so I just didn't drink the water. When I got home & took out the charcoal koins, they were rusted! See photos.<br /><br />No wonder my water tasted like iron. But how does charcoal have the ability to oxidize & rust? That isn't possible for true charcoal.<br /><br />I boiled these 3 pieces to see if it was just a weird coating. Nothing changed. The photo shows the rusted pieces after a re-boil. I returned this product because rusty charcoal isn't safe at all!<br /><br />And it ruined my S'well bottle. I've used bicarbonate +vinegar, and then just soaked in vinegar for 2 wks, but the bottle's stainless steel interior has permanent marks. Not scratches, but like corrosion. Oh, my!
Rating: 1 stars