What are the symptoms of nephritis?

In Bright's disease $(Nephritis)$,which of the following occurs?

As compared to plasma,all are the constituents of dialysis fluid,except

Majority of kidney stones consist of crystals of . . . . . . .

Blood is drained from a convenient $P$ of a patient and is pumped into a dialyzing unit after adding $Q$. After purification,$R$ is added to the blood,and it is returned to the body through $S$.
$\quad \quad P\quad \quad Q\quad \quad R\quad \quad S$

Given below are two statements regarding peritoneal dialysis. Select the correct option.
Statement $I$: Peritoneal dialysis can be carried out as per the need of the patient,i.e.,at work or while travelling.
Statement $II$: Peritoneal dialysis is more efficient than haemodialysis.