This product contains harvested Romaine leaf. The crop is grown in Hydroponic growing system with zero use of pesticide. The crop is grown with balance use of water soluble fertilizer. We are eliminating any source of contamination from soil, ground water, or by air. This is achieved by replacing soil with the specific growing media, ground water by RO water, grown in protected environment to avoid contaminated air. We are also killing any germ buildup by passing the irrigation water through UV light treatment. So, we are asuring most healthy produce to our customers.