In some cases, boiling and filtering water at home can reduce the amount of nanoplastics and microplastics such as polystyrene, polyethylene, or polypropylene in it by up to 90 percent, reveals a study conducted by a Chinese team of scientists from Guangzhou Medical University and Jinan University.https://www.notebookcheck.net/Plastics-free-water-easy-to-produce-at-home-according-to-scientists.873513.0.html
I would think the addition of salt and minerals might be necessary for distilled water, but why for boiled water? Does it bind with the micro plastics and get filtered out?
Depends on the water and boiling time. I also know personally people who add salt to boiled water for drinking after it cools down because they consider it tasteless. Also, some minerals end up on the walls of the recipient used for boiling.