AquaChek Nitrate/Nitrite Test Strips Tests for: Nitrate/Nitrite This specialty product for pool professionals gives results for nitrate/nitrite levels in less than a minute. FIND AN AquaChek RETAILER Product Demos FAQ Product Information Recommended Products Product Information Nitrate: 0-50 ppm Nitrite: 0-3.0 ppm Bottle. Nitrate Nitrogen / Nitrite Nitrogen. Recommended Products HachDPD Pro One Minute Phosphate Test