Flush flow rate

[IanPoulin]

Does anyone know the rate of flow (gpm) capability of the modern airstream black tank flush system? I am concerned my flush may be blocked (and taking some steps this week to do a rid-x ultra soak in a "full" tank to try and cut any previous build ups from the prior owner.

I guess I am curious if the flush on a international serenity 28' black tank is physically located on the top, side or bottom of the tank - and is it merely a spray or a probe into the tank itself?

I have no leaks of any kind when pressurized water is hooked to it. It just seems slow but I'd like to do the maths to verify that angle.

Ian