Swimming Pool Phosphate Test Kit, Fast Accurate Phosphate Test Strips for Swimming and Spa

Phosphate content between 0 and 100 ppb, maintaining a very low phosphate content for clean and healthy water in swimming pools. Pour 5 ml of water sample into the color measuring tube. Place the strip in the colour measuring tube, close the lid tightly and shake upside down twice for 10 seconds. Wait 2 minutes, then remove the test strip. Follow the instructions to compare the colour map.