The amount of liquid compared to gas in a limestone-gypsum wet flue gas desulfurization system affects how well it removes sulfur. Tests showed that a higher liquid to gas ratio led to better sulfur removal, especially when the ratio was below 8 L/m^3. As the ratio increased, the difference in limestone concentration between the inlet and outlet of the absorption tower decreased, while more limestone dissolved in the absorption section. This caused the slurry's limestone concentration to rise.