Flexi Says: Stones form in the kidneys and may be found anywhere in the urinary system. Often, stones form when the urine becomes concentrated, allowing minerals to crystallize and stick together. Some stones may need to be removed by surgery or ultrasound treatments. Chronic kidney disease is the slow decrease in kidney function that may lead to permanent kidney failure. A person who has lost kidney function may need to get kidney dialysis. Kidney dialysis is the process of filtering the blood of wastes using a machine. A dialysis machine filters waste from the blood by pumping the blood through a machine that does the work of a kidney. The filtered blood is then returned to the patient’s body.