... control and fluid loss reduction in all water-base mud systems, including freshwater, brackish water, seawater, salt, ... a consistent pH. FCLS is most effective in mud systems with an alkaline pH in the range ... capacity. It is suitable to all kinds of mud. 2. Effective at temperatures of more than 150 ... FCLS is a good emulsifier for oil in water mud.5. ApplicationsFCLS may be added to drilling fluids ...