I've got an American Standard Glenwall that was installed as part of a remodel a couple of years ago.
It replaced a standard floor-mounted toilet because the location moved by a couple of feet. Rather than notch a floor joist for the waste line, I thought a wall mount would be nice. It's convenient when it comes time to mop the floor too...
But I'm pretty unhappy with it.
First, there's the flush performance. It's powerful, and usually takes care of solids, but any light material (paper or otherwise) floating on the surface of the water just gets tossed around on the surface, and often doesn't get flushed away on the first try.
Next, there's the noise. It's loud, probably because of the volume of air the flushmate introduces. The noise isn't a "thump" as described earlier in the thread, but rather a huge spray/whoosh sound.
I got an idea that maybe the pressure assist flush thing was required because of the possibly long in-wall horizontal run associated with a typical install. In my case, the only horizontal bit is the cast iron carrier. The waste line immediately turns down at about 30 degrees where it exits the cast iron. Maybe I could replace the flushmate with a normal mechanism?
Imagine my disappointment to discover that all of the water blasted out of the power unit's large outlet flows through two dime-sized holes at the bowl entrance. Of course a gravity flush mechanism didn't work.
So, I put it back together with new gaskets and now I have a leaky disaster.
I've tried 3 different gaskets (every one they had at the orange store), and none will create a seal that stands up to the pressure produced by the flushmate unit.
I've tightened the tank-to-bowl bolts until the tank makes contact with the bowl on all four "feet" (little standoffs between the tank and bowl), but the fit isn't tight enough.
Whether a particular flush will produce a leak is unpredictable, but the leaks (when they come) sometimes produce as much as a quart of water blasting all over the walls!
Ugh.
Am I doing something wrong? I took the cartridge out, and adjusted it according to instructions I found online (install the cartridge until water stops flowing into the bowl, then ensure 1/8" clearance at the actuator)
Is there a particular gasket I should be using? The one that came with the unit was a slightly oversize red one with a hex cut-out for the large nut on the flushmate unit, but the American Standard replacement part is black according to photos I've found online.
Perhaps I can lower the flush power by reducing the amount air drawn in by the flushmate? The air is the "spring" that does most of the work, as I understand it.
I've examined the bowl and tank and don't believe they're defective, just a stupid design. The tank-to-bowl gasket is under a tremendous amount of pressure because the huge blast of water (firing a charged flushmate without a toilet was pretty impressive) is forced through such tiny holes at the bowl inlet.