https://culinesco.com/how-to-s...
Check out this website, (it's safe), for info about growing your micro greens.
During the 70's I lived in a commune and learned about growing alfalfa sprouts. They are quite delicious on sandwiches and I think anything you can grow yourself is superb.
Now they have kit's for growing sprouts, but the way I learned to do it was with the Mason Jar and stainless steel screen. I like the idea of the new plastic screen too, but the main thing is to keep your jar and screen sanitized after each batch in order to have a safe growing environment.
Also, if you tilt the jar in a drying rack the air can circulate much better. Hope the website and this info helps. Happy sprouting!