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The pH of drinking water is very important and should be between 6.2 and 8.5, with a domestic ro system the alkalinity level varies depending on location, but may vary from 80 to 400 ppm (mg/L). Although domestic ro systems are great for removing contaminants that have low solubility at high temperatures, they are not good at removing dissolved metals or organic chemicals which have high solubility in water. Another interesting tip is that domestic ro system filters should be changed on a regular basis, some domestic ro systems have cartridges that need to be replaced every 3 months, while some domestic ro systems can last up to 6 months.