So I've read it's best to have a vent in the vessel to allow for gas exchange whilst obviously keeping the bad guys out. I'm thinking about using erlenmeyer flasks with a rubber/silicon bung in the top and drill a hole in it and stuff it densely with cotton wool. Will this work to keep the nasty microbes and fungi out? Has anyone else done this? I know I need something that can filter down to 0.2um or is that a bit over the top?
I want to be able to reuse my vessels over and over hence wanting to use pyrex glass or baby food jars or something that is glass. But this whole vent hole thing has be a bit bamboozled. Any ideas? please
I found some little round adhesive discs but they are very expensive. Like $1 each, and also I doubt they'd stick that good to a rubber bung although I'm unsure. Maybe I just bite the bullet and buy those. Any cool hacks any knows of in regards to vents in vessels that they wanna share?
I did a search on this forum and haven't managed to find a lot of information on this topic, unless I've missed it.