O1 is drawn from a deep aquifer where sands and gravel between boulders from the ice ages form huge natural filter beds. This is what gives this rarefied water its perfect clarity. The natural purity of the aquifer is protected in perpetuity under thick impermeable layers of prehistoric geological deposits.

The water’s journey begins as tiny droplets, melted by the sun’s rays, trickle through cracks in cliffs into a ground of crystalline rocks. Percolating through metamorphosed sediments and underlying granites, the water continues along its intricate path. It remains a mystery how long it takes this snowmelt to eventually arrive through undiscovered underground springs at the O1 source aquifer. It is here that sands and gravel between boulders from the ice ages form the final stage in O1’s journey, acting as huge natural filter beds for this rarefied water. The natural purity of the aquifer is protected in perpetuity under thick impermeable layers of prehistoric geological deposits.