Enjoy Sealand Birk Elderflower Birch Juice (10x11.5Oz). A birch tree naturally filters over 100 litres of water through its root system a day, the natural root filtering purifies and adds minerals/nutrients. A single birch tree can hold hundreds of litres of natural birch tree juice. Sealand birch tree juice is tapped and harvested before the trees get leaves. Enjoy Sealand BIRK cold. . Note: description is informational only. Please refer to ingredients on the product before use. Please address any health or dietary questions to your health professional before using this item.