We have recently installed a Monte Carlo back to the wall pan, with the recommended cistern height but find this doesn't flush properly. Solid waste is no problem, it is the toilet paper that seems to get pushed around and not flushed away. We think the throat of the pan to the soil connection is too small at 64-66 mm. The soil connection is 82-78 mm. We think this causes a back surge when flushed. Has anyone else experienced this problem with the Monte Carlo.
