Our Pool Check® Phosphate provides a quick, easy, and reliable method for testing phosphates in pools. Because phosphates are the primary food source for algae, the more phosphate, the more algae. High phosphate levels can produce resistant algae and interfere with the sanitizing property of chlorine. Regularly testing for phosphates can help to ensure a properly maintained pool. With the advanced technology in our Pool Check® Phosphate strips, reliable results are available in 30 seconds.