TABLE 1:Traditional deposit forming problems, their origin, and control method in papermaking    Deposit Problem  Origin  Control Method  Pitch  Virgin pulps,particularly mechanical and sulphite pulps  Ageing of wood.Efficient pulp washing.Chemical treatment with alum,talc, dispersants,enzymes  White Pitch  Coated broke  Selection of binder polymer treatment  Hydrolosis products  AKD and ASA sizes  High fines wire retention. Low dose alum treatement  Stickies  Recovered paper  Deinking and screening Chemical treatment with polymers, dispersants, detackifiers.  Slime  Biodegradeable materials such as starch  High startch water retention. Water disinfection. Regular machine cleaning. biocide addition