When it comes to DIY dishwasher detergent, not all salt is created equal. Kosher salt is coarser than table salt, which is what makes it a better choice for this recipe.u003cbr/u003eBecause table salt has much finer granules, it can block your dishwasher and cause damage down the road. The larger Kosher salt granules dissolve more slowly and are less likely to cause any dishwasher blockages.