A process for producing crystals of neutral calcium hypochlorite of good filterability from a lime containing about 600 or more parts per million by weight of iron as Fe comprising reacting a slurry of lime with a chlorinating agent to form crystals of a basic calcium hypochlorite, preferably dibasic, adding a barium, zinc, strontium, cadmium, silver or mercury salt to the slurry to precipitate the ferrate and/or ferrite ions as an insoluble or substantially insoluble salt, allowing the basic crystals to settle out of the slurry, removing the supernatant suspension containing the salt from the crystals, and converting the basic crystals into crystals of neutral calcium hypochlorite.
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