Yokuchi Mitsuru Aquarium Refill NH4 - Test Refill

Yokuchi Mitsuru Aquarium Refill NH4 is the original refill for the Yokuchi Mitsuru Aquarium Test NH4 drop test. Mitsuru is a line of drop tests for checking the key parameters of aquarium water.

The refill is meant for the aquarium NH4 test, which measures ammonium ions, or ammonia, in the water. According to the product data, the measurement helps to judge whether biological filtration works properly and whether nitrogen compounds are building up excessively.

According to the description, the test is especially useful after starting an aquarium, after cleaning the filter and after adding more fish. Run it as well when the condition of the fish suddenly gets worse.