Measures the phosphate levels from 0, 100, 200, 300, 500, 1000, 2500 ppb in 15 seconds. The Phosphate strips are packaged 25 strips.
The Insta-Test® Phosphate pool and spa strips provide very quick and reliable water test results. Phosphates are important contributors to algae growth and can reduce the effectiveness of some automated chlorinated systems. This unique test allows the user to read low range test results by looking down in the reacted sample tube. Test instructions are on the bottle along with a color chart. Keep phosphates below 300 ppb to avoid problems in your pool or spa equipment.