Kosher Salt for Sauerkraut: Pickling, Iodized, and Sea Salt Compared

Yes, with a caveat about the label. NCHFP says fermented and non-fermented pickles may be safely made using either iodized or non-iodized table salt, but noncaking material added to table salts may make the brine cloudy. Plain table salt with no anti-caking agent behaves exactly like pickling salt by weight, 288 g per cup on this site's tables. Check the ingredients: most table salt carries an anti-caking agent even when it carries no iodine, and that is the part worth avoiding if you have a choice.

No, not by the one study that tested it. NCHFP lists iodized table salt as an acceptable choice for fermented pickles, and a 2018 study in Food Microbiology (Muller et al.) found iodized salt did not statistically significantly change the lactic acid bacteria populations during sauerkraut fermentation. Extension services still hedge: Colorado State Extension tells home fermenters to use non-iodized salt with no added anti-caking agents for best quality, and University of Minnesota Extension says salt should be iodine-free because iodine can interfere with fermentation. Treat that as a precaution rather than a demonstrated failure. A batch already made with iodized salt is not lost.

Refined, fine sea salt with no anti-caking agent works fine and this site treats it the same as table salt by weight, 288 g per cup. Read the label the way you would for table salt, since some fine sea salts carry an anti-caking agent too, the same cosmetic cloudiness NCHFP describes for table salt. Unrefined sea salts like Celtic grey are a different case because they are not pure sodium chloride; see the Himalayan and Celtic answer below.

Yes, but weigh it and account for purity. Himalayan pink runs about 97% sodium chloride by weight, so 20 g weighed onto the scale delivers roughly 19.4 g of actual salt, not the full 20. For a 1 kg batch at 2% that gap is close enough to ignore, but for anything stricter, divide the target salt grams by 0.97 to get the product weight to actually weigh out. Coarse pink also takes roughly 20% more volume than table salt to hit the same weight, so a spoon measurement is the wrong way to use it either way; the kimchi and sauerkraut calculator does this math automatically.

Almost always it is a measuring problem, not a chemistry problem. A cup of Morton kosher (230 g) and a cup of Diamond Crystal (134 g) are close to double each other by volume, so a recipe written for one and scooped with the other lands well under or over 2%. Too little salt gives softer, slipperier kraut and less protection against spoilage organisms in the first days, which is what NCHFP's warning against cutting back on salt is about. Too much slows the lactic acid bacteria down and can stall the ferment. Weighing the salt, whichever type it is, removes almost all of this risk.

Pickling or canning salt is NCHFP's own recommendation: plain sodium chloride, nothing added. Kosher salt, Diamond Crystal or Morton, works the same way and is already in most kitchens; both labels list no iodine and no anti-caking agent. Either is this site's default in the sauerkraut and kimchi calculator. Plain fine sea salt without additives is a solid third option. What they share is purity, not a brand name.

Yes. Both are plain sodium chloride with a NaCl share of about 1.00, and NCHFP's recommendation for pickling salt applies equally to kosher. What changes is the grain, and therefore the volume: a cup of Diamond Crystal weighs 134 g and a cup of Morton weighs 230 g, nearly double, so a scale matters more than the brand does. Weigh the salt to whatever gram figure the 2% target calls for and the type stops being an issue.

It works, but it is not pure salt. Celtic light grey's own label puts it at about 81% sodium chloride by weight, the rest is moisture and trace minerals, so a 2% target that assumes pure salt is really closer to 1.6% if the product weight is used as-is. The kimchi and sauerkraut calculator divides the target salt grams by that purity share automatically when Celtic or another unrefined salt is selected. It is usable; it is just not a gram-for-gram swap for pickling salt.