The ADA Pack Checker (NH4) allows you to accurately measure the ammonium levels in your aquarium. Ammonium is from organic matter, such as unconsumed fish food or excretion of fish, and it changes to a high toxicity ammonia when the water quality becomes alkaline. Ammonium disappears once biological filtration works normal. This product helps you to know when the biological filtration starts working properly, helping maintain a delicate balance within your aquarium.
Each pack contains 5 test with instructions included.