Seaweed is filtered based on the chemical compounds it contains, so that it is known as carrageenan-producing seaweed (carrageenophyte). E. spinosum seaweed is a type of carrageenan-producing seaweed (iota carrageenan). Treatment factors such as time and KOH concentration can affect the quality of the carrageenan produced. The aims of this study were to analyze the best time and KOH concentrati…