Check the listing for details. Seachem Ammonia Alert. Condition: New. Listed at 10.69 USD. Home View All Listings Contact Us Feedback Menu Aquarium Supplies Pond Supplies FOUNTAIN PUMPS POND FILTER MEDIA POND FILTERS POND FOOD POND LIGHTING POND NETTING POND UV STERILIZERS POND WATER PUMPS POND WATER TREATMENTS GIFT CARDS Reptile Supplies Small Animal BIRD WILD BIRD Seachem Ammonia Alert Description Payment Shipping Returns Contact us Description Ammonia Alert is an innovative color device for continuously detecting and monitoring toxic free ammonia. A sensor changes reversibly from yellow to green to blue, relative to the ammonia concentration. No test kits, chemicals, or procedures are needed. The device detects less than 0.05 mg/L (ppm) free ammonia and alerts you to the #1 killer before any sign of stress. It lasts over a year. This product is not recommended for use at acid pH. Marine or freshwater use. In the absence of free ammonia the unit will assume a yellow or faint yellow-green color. It is normal for the dry sensor to have a greenish hue. It may take up to a few days for a dry sensor to equilibrate with the water. No sampling of water, chemicals, or test procedures are required. The presence of the free ammonia is detectable continuously with a response time of about 15 minutes. Response to decreasing ammonia is slower, requiring about 4 hours to go from TOXIC to SAFE on removal of ammonia. Interpretation Safe