A composition having biocidal properties is disclosed. The composition includes a first biocide that synergistically operates with a second biocide to destroy or inhibit the growth of at least one microorganism. The first biocide comprises a quaternary ammonium salt. The second biocide, on the other hand, may comprise a quaternary ammonium compound, an amine, and/or a pyrithione. The composition is particularly well suited for use in disinfectant products and for use as a preservative.
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