How can I prevent or remedy "bio slime" accumulation in a sink drain?
This has been an ongoing problem in the bathroom sink we use the most. When I was using conventional solutions (Drano and the like) to unclog it, I just assumed that there was a bunch of hair in the drain. This was a problem every couple of weeks, though, and I hated spending so much money on toxic drain cleaners. A couple of years ago, I happened across a long and flexible, toothed tool called Zip-It at the hardware store, and I've not had to invest in drain cleaner since. Since this tool pulls whatever's clogging the drain out of it, I learned that it wasn't only hair causing the sink to backup - it was also tons and tons of black slime. It's pretty gnarly, but it's satisfying to know that I'm actually physically removing this stuff from the drain! I saw that the tool is sold online as well, and I noticed that it's marketed in some places as a one-time use tool, but that's ridiculous. I've used the same one since I bought it two years ago, and it still works as it should. It's really cheap, though (I think I paid $3 for it), so even if the teeth do break off, it's easy enough to buy another one.

That drain still clogs with black slime every couple of months, and even though I can pull it out, I'd like to prevent it if possible. So, I'm going to start using baking soda + vinegar + hot water to see if that works to prevent it.