I'm sure this is a very common problem - slow draining shower. I've been snaking it about once a year and that usually speeds it up. The last few times that I snaked it, it sped up but it's not as fast as it used to be. Should I invest in a longer snake or just pour something down the drain after I use my 25 foot snake?
like you mentioned your drain is definitely clogged.
You can try the Drano and all those chemicals see if it works.
25 ft would really be enough, strange that it's still clogged.
they don't usually go deeper than that but you can always go deeper than that if you feel comfortable and hope your snake will come out. 😌