True hydrosols are the intentional distillation of fresh plant material distilled at low temperatures to preserve the bioavailable constituents contained within the plant. Hydrosols are also known as floral waters or hydroflorates. Hydrosols are water based aromatherapy- similar to essential oils but in less of a concentration. When distillers brew plant material with water in a specially designed copper distiller, the steam fills the pot causing the glands of the plant to burst open and release the oils and essence of the plant into the rising steam. The cellular essence rises through a condenser and collects in a separate vessel rendering a hydrosol.
Waters produced during a similar process for the purpose of collecting essential oil are not considered true hydrosols. The highest quality hydrosols come from the devoted distiller who, with artist like precision, steams the floral and plant material strictly to produce a hydrosol. Hydrosols contain all of the essence of the plant in every drop, just like essential oils but in a milder form; making them suitable for all manners of application where essential oils would be too strong.
A mix of plants distilled simultaneously and formulated to yield a hydrosol with specific purpose, e.g., acne distillate. The yield of the co-distillate is a different product and would be a mixture of the two separate distillates. A marrying of the constituents occurs during the distillation. In the words of Aristotle: "The whole is greater than the sum of its parts."