NutraFin Reagent Refill for Calcium Test Kit – #2

Nutrafin Calcium Reagent Refill #2 for use with Nutrafin Calcium Test Kit. Marine reef aquariums, especially those containing hard corals and strong growth of coralline algae absorb calcium at a rapid rate, often require daily testing to ensure that the calcium levels remain at an optimal level for the aquarium inhabitants. 6ml.