HI758-11 Hanna Instruments HI758-11 Marine Calcium Checker® HC Calibration Check Set dosing additives Those do require being topped

Those do require being topped off with RODI water and sitting until the solution is fully dissolved

A more economical version suitable for a one time major correction is the Salifert Magnesium-powder

One of the scientific studies shows that a phosphate concentration higher than 0

About FritzZyme® Trace

Can be used to clean the inside of empty aquariums

HI758-11 Hanna Instruments HI758-11 Marine Calcium Checker® HC Calibration Check Set dosing additives Those do require being toppedThe Marine Calcium Checker HC Calibration Check Set HI758 11 provides a simple solution to validating the Marine Calcium Checker HC HI758 that has a range of 200 to 600 ppm calcium. This high quality set of standards is manufactured in our state of the art facility and comes supplied with a Certificate of Analysis. The Certificate of Analysis provides the lot number, reference values and expiration date for traceability when certifying the CheckerHC.