Often stone patients will ask: Our local water is too hard, could this be the cause of stones? Now there are a lot of people who will worry that the water we drink will not cause kidney stones. In fact, there is not much relationship between bad water quality and kidney stones. The hard water quality refers to the high calcium ions contained in the water, so people usually think that after drinking hard water will make the blood calcium rise, which will lead to the production of stones. In fact, this is not the case. When water with high calcium content enters the intestinal tract, the calcium can combine with oxalic acid, another stone culprit, to form calcium oxalate, which can be eliminated from the body. Therefore, although the patient’s blood calcium may be slightly elevated, the oxalic acid level is reduced and therefore does not increase the risk of developing kidney stones. Stones are a common disease that occurs in the urinary tract, and the incidence of kidney stones has been increasing in recent years. Primary stones are of unknown origin, while secondary stones are often caused by metabolic abnormalities, endocrine disorders and chronic pyelonephritis. However, patients with stones should not drink strong tea and should keep the urine volume above 2000ml throughout the day, which is more important than the softness of the water.