The Fundamental Filter Stone works the same way traditional water filters work, just without wasteful plastic casings.
Use for 1-3 months depending on your (water) drinking habits, and then send it back to us for proper disposal.
Fundamental Filter Stone
Learn more about our stone, how to purchase, and delivery options.
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We use a coconut shell and charcoal formula (so do the leading water purification companies).
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You can purchase single replacements, but we recommend purchasing in bulk for six months or a year. This is the most sustainable option, considering shipping and delivery impact. (It’s also the most cost effective for us & you).
New York locals can also arrange to pick-up their replacement stones at our stockists.
