I have just fitted a new low level dual flush WC, The short flush seems to be very short only just serving its purpose, Can you adjust the flow or is it factory set.
Some are adjustable to give different flush quantities such as the dudley duo flush syphon. Remember the old saying 'if all else fails, read the instructions'
If its torbeck, then there might be a blue ball or similar, adjust this along the rod its on to give a greater flush.
Be careful as its possible to knock off the lever mechanism which it is connected to. Easy to get back on, but you might have to remove the whole unit, in which case you'll need to isolate the wc supply.
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