In this study, a study on the growth of Tetraselmis sp. and contamination of the organism of a different type. The culture is different from water, salt water, salt water and salt. And raising the salinity are five levels: 40, 50, 60 and 70 ppt by counting cells in recipes F / 2, recipes with study results: algae Tetraselmis sp. raising the salinity of 30 ppt in from different water sources found in salt water, failed disinfection is steaming the growth to a maximum equal to 2.91x 〖10〗^5 cell/ml, and the study of specific algae growth. Tetraselmis sp. salinity, algae Tetraselmis sp showed different. in salt water to 30 ppt salinity disinfection with highest growth to 3.63 x〖10〗^6 cell/ml