The chemical abnormalities relate to the type of stones that form in the kidneys. These four types of stones and the chemical abnormalities that cause them are: Calcium Stones: people who form this type of stone either have too much of one type of three chemicals in their urine, or not enough of another.
Therefore, we recommend replacing your refrigerator's water filter typically every six months or when the gallon capacity is reached. We offer compatible replacements for Whirlpool refrigerator water filters, Kenmore, Frigidaire, Samsung, LG, Maytag and other popular refrigerator brand water filters.
According to GM's normal maintenance schedule, the air filter should be replaced arbitrarily every 60,000 miles whether it needs it or not. However, I replace it every two (2) years or 24,000 miles, whichever comes first. I base my recommendation on the environment in which I drive my vehicles.