Not sure if it’s really gritty. Seems it is to a degree. But more like table salt. I stirred it for a bit and it was pretty scratchy for a while but dissolved entirely after about 2min. I think it’s more water pressure and chemicals doing that job. It sure seems abrasive to coated surfaces, though. I used to put my non-stick pan into the dishwasher. And it wrecked the surface over the course of several months or a year or so. Now I’m not doing that any more and the pan after that lasted me longer. Just my anecdotal evidence, not science… But I’m positive that’s why we’re not supposed to put these things in there. I guess putting a non-stick pan in 5 or 10 times wouldn’t make a noticeable difference, though.