The properties of the white willow tree have been known since ancient times, when it was a highly regarded medicinal plant. The active ingredient, salicin, is known to reduce fevers and relieve pain. Willow Water contains this ancient medicine in trace amounts, due to the spring's proximity to an ancient willow forest. Thousands of years ago, willow trees covered the hills of Britain's Cumbria region. Over time, the forest slowly disappeared, its limbs and trunks forming a thick layer of peat that rain and melting snow must pass on the journey through layers of limestone before reaching the aquifer. Due to the presence of limestone, Willow Water is also naturally high in calcium; drinking it daily will aid in reaching necessary nutritional requirements of this mineral. Enjoyed for its health benefits in addition to its subtle flavor and natural character, Willow Water is a unique alternative to other bottled water brands.