The popular high sensitivity phosphate test kit is an excellent way to monitor phosphate levels within your marine or reef aquariumr monitoring and maintaining low levels of phosphate helps to stop the rise of increased algae populations which act as a calcification inhibitor in stony corals and clams and is a limiting factor in achieving good coloration in coralsr using this high sensitivity test kit will allow monitoring of levels of phosphate measured as po4 or p po4 with the aquarium so th