The FI-NITRATE filter is a strong base anion exchange resin that removes nitrates preferentially in the presence of sulfates and other divalent ions. It has a 10 micron nominal rating and offers a long service life, capable of treating up to 5,000 ppm (mg/L) of nitrate in water at a very fast flow rate. Nitrates have no detectable color, taste or smell at the concentrations involved in drinking water supplies, and they do not cause discoloration of plumbing fixtures, so they remain undetectable to our senses. Often found in rural areas, nitrate levels should not exceed 10 mg/L. This is especially important for newborn infants of up to six months because their digestive system is particularly susceptible to nitrates. Individuals who continued exposure at above acceptable levels can cause diuresis and increased starchy deposits and hemorrhaging of the spleen. Influent and effluent nitrate levels should be monitored to ensure adequate removal.