--We have 1 working unit with an oil-free pump ($8000), along with 3 other units with oil-free pumps ($2000) that need maintenance!-- Harvest Right’s Pharmaceutical Freeze Dryer removes water from plants and organic compounds while they are in a frozen state. This locks in the freshness of herbs and plants. Their appearance, nutritional content, and potency remain the same as when they were fresh. Freeze drying completely removes water in about 24 hours. No other preservation method comes close to removing water this quickly. This is important because the longer a harvested plant or compound retains water, the greater the chance it has of spoiling and losing nutrition and potency.