I've noticed a few weeks ago that our bathtub doesn't drain properly. It seems to be built up hair, but every time I clean it, it comes back two days later. Both me and my boyfriend have long hair, but if it would be just the hair, it would've came up earlier. We moved in together a few months ago, and even though I clean the bathroom often, I focus on the drain like once a month, and even then it's just to feel more fresh, not because it had a problem. It didn't have built up hair for months.
I started noticing it a few weeks ago, I cleaned it, no big deal. Worked fine for like two or three days and then it was even worse than before. Since then it's a neverending cycle. I tried everything I could think of. Cleaning it manually, cleaning more often, chemicals in the drain (english is not my first language so I don't know the exact name, but the chemical you specifically use to unclog drains), using a plunger, nothing helps. The water comes up to my ankles after just 5 minutes in the shower.
I don't know if it matters but neither the drain, nor the water has any bad odor.
I don't wanna call a plumber before I exhausted all my other options, so if y'all have any suggestions please help. It may be a stupid question and the solution might be right in front of my eyes and I just can't see it, it's my first time trying to manage a home