Abstract: To provide a polyvinyl alcohol composition effectively suppressed in generation of an aggregated product, in a method for producing a wetting agent for a semiconductor, containing a polyvinyl alcohol composition. A method for producing a wetting agent for a semiconductor, containing a polyvinyl alcohol composition, wherein the polyvinyl alcohol composition is obtained through an addition-in-liquid step of adding into the inside of any one solution of a first liquid containing polyvinyl alcohol and water and a second liquid other than the first liquid, the other liquid of the first liquid and the second liquid.

Abstract: Provided is a method for filtering an additive-containing liquid that can achieve a polishing composition exhibiting excellent defect reducing capability while maintaining a practical filter life. The method for filtering a polishing additive-containing liquid provided by the present invention includes the step of: filtering the polishing additive-containing liquid with a filter that satisfies the following conditions (1) and (2). (1) The average pore diameter P measured by a palm porometer is 0.15 ?m or less. (2) The pore diameter gradient (Sin/Sout), which is the ratio of the inlet-side average pore diameter (SO to the outlet-side average pore diameter (Sout), both diameters being measured through observation with an SEM, is 3 or less.