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Red Sea Phosphate Mini-Lab Test Kit $12.95 $11.99 RS3119 60 tests. Detects 0.1 to 3.0 ppm of phosphate PO43- ion in marine and freshwater aquariums. Introduction to Phosphate All living matter, both animal and plant, contains about 1% Phosphorus in the D&D Merck Phosphate Test Kit $149.99 $105.99 RW3111 Our Phosphate test kit was developed in conjunction with Merck. This new test kit is simple to use and incredibly sensitive down to the low levels required for both saltwater and freshwater aquarium Tropic Marin Phosphate Test Kit $20.99 $12.99 TP4125 For the determination of the phosphate concentration in fresh and seawater. Phosphates are an important food component of all plants and absolutely necessary for the metabolism of every living cell.