Toilet is not flushing solids away.
Toilet is tankless siphonic type.
It was installed about a week ago in newly refurbished bathroom on first floor, connected to 15mm water mains supply (good pressure and flow). Waste is connected horizontally through short straight pan connector into new 4" waste. Entire soil stack is new, with open to air vent.
![](https://s2.save4k.ru/pic/9sEUzLDMBr4/maxresdefault.jpg)