Yes you can, but this glass water filter jug isn't the way to do it. It can be done using binchotan charcoal sticks which take several hours to absorb the contaminants in the water, and it can be done with a ceramic benchtop water filter with a ceramic filter inside (although they do have a very small amount of plastic on the mount that holds the cartridge in place), but at the end of the day, filter cartridges are usually housed in plastic, including the filters that go with this jug. And we do not see this an issue.