An aqueous composition comprising: (a) 4,5-dichloro-2-octyl-4-isothiazolin-3-one (b) a tertiary amine comprising three C2-C6 hydroxyalkyl groups, wherein at least one of said hydroxyalkyl groups has a secondary hydroxyl group (c) an oil selected from the group consisting of mineral oil, neutral oil, castor oil, and combinations thereof (d) a paraffin wax and (e) a nonionic surfactant having from 20 to 50 polymerized ethylene oxide units.
