The JBL ProAquaTest Ammonia NH4 REFILL provides the required reagents to replenish your JBL ProAquaTest Ammonia NH4 Water Test Kit. Regular water testing is key to a healthy aquarium or pond. The JBL Ammonia NH4 Water Test Kit allows the easy determination of the Ammonia level in your pond or aquarium from <0.05 - 5.0mg/l using a colour change test and is suitable for both freshwater and saltwater use. JBL ProAquaTest Ammonia NH4 REFILL contents: 3 reagents Why test for Ammonia? The degradation or mineralisation process of all organic substances in an aquarium or pond follows these stages: proteins > ammonia > nitrite > nitrate. By measuring these stages conclusions can be drawn about how well the biological processes are functioning within the aquarium or pond. High levels of ammonia or nitrite are toxic to fish and can lead to disease outbreaks or even fish fatalities if not resolved swiftly. Recommended Ammonia Values: Freshwater aquarium (community aquarium): < 0.25 mg/l Lake Malawi/Lake Tanganyika aquarium: < 0.25 mg/l Plant aquarium with few fish (aquascaping): < 0.25 mg/l Marine aquarium: 0-0.25 mg/l Pond: <0.1 mg/l You can analyse the water values you have measured in the JBL Online Laboratory free of charge and receive recommendations. Refill reagents only Easy to use Ammonia NH4 water testing Determines Ammonia level from <0.05 - 5.0mg/l Suitable for both freshwater and saltwater use Free use of JBL Online Laboratory for analysis and recommendations Contains approximately 50 tests Child-safe reagent bottles Requires JBL ProAquaTest Ammonia NH4 Water Test Kit (Available Separately)