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Aquarium Pharmaceuticals Freshwater/Saltwater Phosphate Test Kit, Test Kit of 150 tests $11.99 $7.99 AP3133 Test reads 0 to 10 mg/ or parts per million (ppm) of phosphate. Helps to decrease the likelyhood og having unsightly algae and green water blooms.Test kit of 150 tests. Why test for Phosphate? 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 Salifert Phosphate Test Kit $41.99 $24.99 SF1133 Salifert Phosphate Profi-Test If phosphate is present in too high a concentration there may be an increase in growth of undesirable algae and if the phosphate level is higher than 0.04 mg/L