The researchers studied how adding a coagulant before filtering water affects the performance of different types of membranes. They tested various factors like the type of water, coagulant used, dose of coagulant, and membrane material. They found that adding the right amount of coagulant can reduce fouling on the filters. Low doses of coagulant can actually make fouling worse, but higher doses help. The type of membrane used also plays a role in how well coagulation works. Overall, coagulation can help remove dissolved organic matter from water, reducing fouling on the filters.