Hi!
I have a bath tub water draining problem and now it even worst, for it need 30 minutes to get all water away, Since than I try to use lots of liquid plumr on it. But it helps not long.
I think it's pipe line must have lots dirt. So I purchase a snack and try to only the bolt under bath. But it was hard to turn (may be it get rust inside.
Right now I'll need input for how can I loose it out?
Ps. I had try to put snack direct from the tub but fail because of the angle.

To help diagnose this... is there any problem with a sink or toilet in the same bathroom draining or flushing? Or any others in the same apartment or house? Is this bathtub on a ground level floor or basement?

What country are you located in?

You need to SNAKE your drain and sometimes the stopper will be in your way. You could try something called a ZIPIT for about $2.75 at most hardware stores. Cool Tools: Zip-It Drain Cleaner Its important to understand how to SNAKE your tub drain correctly. How To Unclog Bathtub Drain With Plumbing Snake - YouTube