Jase2985:stainless steel mesh with apertures of three millimetres.
Sure, but insinkerators don’t blend the stuff you put into them, they literally just beat the everloving crap out of it until it fits into the exit pipe. Insinkerator even shows a paper that says the exit particle size is between 2.5 to 12.5mm.
Source: https://insinkerator.co.nz/wp-content/uploads/2022/11/Septic_MinnesotaStudy_2019.pdf