This invention provides a method of producing granules. This method comprises roll compaction of a 1,3-dihalo-5,5-dimethylhydantoin/binder blend, followed by feeding the compacted product obtained from the roll compactor into a mechanical device, where the compacted product is broken into granules. The blend comprises (i) at least one powdery or finely-divided 1,3-dihalo-5,5-dialkylhydantoin in which each halogen atom is either chlorine or bromine, in which one of the alkyl groups in the 5-position is a methyl group, in which the other alkyl group in the 5-position has in the range of 1 to 4 carbon atoms, and in which the particle size is larger than about 20 microns, and (ii) a binder quantity of a micronized synthetic polyolefin-based hydrocarbon wax. The binder quantity of wax is in the range of about 0.5 to about 2 wt %, based on the total weight of the 1,3-dihalo-5,5-dialkylhydantoin and the wax. The granules are produced at an increased granulation productivity in comparison to granules of the same 1,3-dihalo-5,5-dialkylhydantoin produced without a binder.