Semi-annual ammonia test. With colour sensor depending on ammonia levels. It would be advisable to avoid contact of the sensor with the hands because it destroys its reliability.

Ammonia Alert® is an innovative colour device for continuous detection and monitoring of toxic ammonia. A sensor reversibly changes from yellow to green to blue in relation to the ammonia concentration. No test kits, chemicals or procedures are required. The device detects less than 0.05 mg/L (ppm) of ammonia and alerts you to the # 1 killer before any sign of stress. It lasts for over a year. This product is not recommended for use in acidic pH. Use marine or fresh water.

If there is no free ammonia, the unit will be yellow or pale yellow-green in colour. It is normal for the dry sensor to have a greenish tint. It may take up to a few days for the dry sensor to equilibrate with the water. No water sampling, chemicals or testing procedures are required. The presence of free ammonia is detected continuously with a response time of approximately 15 minutes. The response to ammonia reduction is slower, requiring approximately 4 hours from TOXIC to SAFE to remove ammonia.

Care
No care is required other than removing the algae with a clean, soft material. Avoid touching the sensor with your fingers, as skin lubricants can damage the sensor. Do not use bleach, soap, detergents or harsh objects to clean the sensor. Some dye medications may discolor the sensor. Sensitivity improves with age, provided the unit is not allowed to dry, however, drying does not permanently damage the unit. For maximum sensitivity, the unit should be read under natural light or simulated daylight. Red enhancement light minimizes green and blue tints, reducing the apparent sensitivity of the unit. The response of the unit may be checked by holding it for a short time in the mouth of an ammonia bottle: the colour should develop rapidly.