Tea Tree Water (Hydrosol) - BiologischWhat is Tea Tree Water (Hydrosol)? Tea Tree Hydrosol is water that remains after distilling essential oil from the Tea Tree tree. It has the same beneficial properties as Tea Tree Essential Oil, but works much milder, so you can apply the hydrosol directly to your skin. Tea Tree (Melaleuca alternifolia) grows naturally in Australia and is a gentle and effective purifier. Add the hydrosol to your favorite DIY care products or use directly as a toner or