Natural Chemistry Phosphate Test is the easiest way to test the phosphate levels in your pool. This test measures phosphate levels from 0 to 2500 ppb. in a matter of seconds. Don't guess your phosphate level, test today.
- Fill test tube to 10 mL line.
- Remove one test strip from bottle. Close bottle cap tightly after removing strip. Gently bend strip in half with pads facing inward. Place strip inside test tube cap
- Cap test tube and invert slowly 5 times (invert tube slowly to allow the bubble to go from the top to bottom and bottom to top).
- Remove cap and test strip.
- Place bottom of test tube on white boxed area of color chart. Look down through OPEN test tube and compare to color chart.