 The most common commercial deep water culture crop is lettuce.Lettuce does best in a pH of 5.6-6.0, EC of 1.1-1.2 (of fertilizer), 17 mol·m-2·d-1 daily light integral which may consist of a combination of natural and supplemental lighting, air temperature of 24 °C day/19 °C night, water temperature of 25 °C, and dissolved oxygen of 7 mg·L-3.The rafts are cleaned after each harvest by scrubbing to remove organic matter and applying bleach or other sanitizing agents.