Seaweed Lettuce (Ulva spp.) is useful for both nutrition and waste water treatment. With some characteristics of algae that can tolerate and growth well. The factors affecting growth include light, temperature, salinity, nutrients or nutrients that algae need turnips. The data concluded that lettuce seaweed can grow the luminous intensity of 3.7 kilolux in salinity and temperature ranging from 17-22 degrees Celsius, 15-25 psu is a reasonable demand, and also lettuce seaweed. The nutrients that are essential for the growth of algae, mustard is the most water-soluble nitrogen in the form of nitrates.