Looked at past posts, but.....<br/>How can I tell what brand toilet is in my FT?<br/>I wanted to raise the water level, turned the black knob clockwise, per directions, but it didn't seem to help ??<br/>How can I tell if the black tank is directly below the toilet? I want to raise the commode about two inches for comfort. Will I encounter any problems.??<br/>I know..... go to mechanical...