Just installed the Toto Aquia Dual Flush toilet. Fixed slow leak from the tank, thanks to the advice found on this forum about sanding the inside of the tank where the bolts go. It seems to be working "effectively" however the toilet bowl does not seem to entirely empty of water upon flushing. The toilet I had before was huge (20 liters?) and I'm just not sure if this is normal for this type of high effiency toilet.