The discharge rate of a cistern is the actual water quantity that leaves the cistern during the flush process and not the contents (volume) of the tank.
For a high flush, flow efficiency in horizontal drains a flow rate of at least 2.5 1/s is required.
The main judgment of flush efficiency in a water closet is the proper flushing out of waste and paper.
During the first half of the flush process a half cistern is empty, the above mentioned solid matters should have left the water closet.
If paper and waste pass too late or not at all, the reason might be an insufficient flow rate of the cistern or the construction of the water closet.
All products and colours shown on the site are indicative only. They may not match exactly with sanitary ware colours.