Water

Most household filters are a plastic cartridge full of beads, swapped every two months and dropped in the bin. They remove chlorine and not much else, and the cartridges themselves shed microplastics into the water they're meant to be cleaning.

Three filters here, three different jobs: binchotan charcoal sticks for drinking water, a shower filter for chlorine and chloramine, and a carbon block for cooking and brewing. No throwaway plastic, no proprietary cartridge lock-in, full ingredient list on every page.