With ever increasing demand to reduce cost and environmental impact,more tinplate producers are looking to switch away from Phenol Sulfonic Acid(PSA)based electrolytes.The tried and tested choice when switching,is the Methane Sulfonic Acid(MSA)based electrolyte.One hurdle to converting an existing PSA electrotin line(ETL)to MSA is the haze problem caused by MSA build up in the flux tank.This haze problem necessitates adding extra rinse tanks or using excessive rinse water to prevent the blue haze caused by MSA in the flux tank.This is because most PSA ETLs have only two tanks after plating,one dunk tank,and one flux tank.Some tinplate producers have installed expensive post rinse flux applicators to get around this problem when using MSA.This paper describes a novel MSA electrolyte and flux system.The flux can be used in the flux tank of all existing PSA lines.The flux is totally compatible with the MSA electrolyte and can be counter flowed back into the plating tank.This unique flexibility negates the need to make expensive modifications to the PSA ETL when switching to MSA.