You need to drink water to survive. Or purified, properly, it can make you very sick, I’d say if water isn’t treated. Whenever vomiting and even death, Water may contain microorganisms that can cause diarrhea. The Environmental Protection Agency reports that 90 the percent world’s water supply is unfit for drinking without some sort of treatment. Water purification systems kill these microorganisms to make the water safe to drink. Other minerals sometimes found in water, like lead and copper, are dangerous to your health. Microorganisms, untreated water is also a source of minerals, including copper and magnesium. They react with other minerals in the water and cause deposits, that may make the water unsuitable for drinking, while and identical heavy metals like mercury. Eventually, if you have a well, you may not be aware that pesticides are in your water unless you have it tested, municipal water can be treated for pesticide contamination. Home purification systems that meet the National Sanitation Foundation and American National Standards Institute recommendations for water purifiers are effective at helping keep your water safe by filtering out all the harmful organisms and metals.
If you’re not replacing or cleaning the filter as recommended, you might be doing more harm than good.