Oaky, I got this one. Bemis makes seats.
So if you lift up your Bemis seat, then yes you can pour water down.
If it's important to flush paper and other odd things down, then you might need to snake it. You still need to lift the seat though. Oh wait. No you do['t have to lift the seat. You can, I mean there's like a big opening in the seat wehre things go down.