Tests for Phosphate. New Free Shipping. Salt & Fresh Water Use  Managing phosphate levels is the most natural way to AVOID ALGAE blooms  The original Single-dip Test Procedure  Note: If saltwater appears cloudy match to the closest color spot. Use 1 test strip for freshwater, use 2 test strips for each saltwater test.   TEST PROCEDURE: 1. Add the water sample to be tested to the top line of one vial.  Dip one (1) phosphate strip for freshwater or two (2) strips for saltwater into the vial for 30 seconds with a constant, gentle up and down motion. Remove the strip from the vial and discard.   2. The sample water in the vial will be yellow (0.0ppm), green (0.2-1.0ppm) or blue (>2.0ppm), depending on the concentration of phosphate.  Place the sample vial on the white circles.  Viewing from the top, slide the vial between color spots until the best color match is found.  The best color match equals the phosphate concentration.  Complete the color matching within 30 seconds.  Phosphate ? Phosphate occurs naturally in the environment.  It is an essential nutrient required for algae growth.  Since phosphates come from a variety of sources, it is recommended that you test your phosphate levels when you open/close your pond and weekly throughout the season.  *Phosphate levels may be lowered through partial water changes or the use of water treatments.  Phosphate Level Guide less than 0.2 ppm ? good 0.3 ppm ? acceptable  0.5 ppm to 1.0 ppm ? high *Treatment required 1.0 ppm to 5.0 ppm ? very high * Treatment required  This test is designed to test for the presence of orthophosphate.    Contains 50 strips each.