AquaChek® One Minute Phosphate Test 20 Tests/Bottle two bottles (powder pillow reagents and testing vial) Use the most accurate method for phosphate testing: a one step, one minute, phosphate test.  Even very low levels of phosphate can feed algae and create problems in pool water. Test for phosphate once a week as the concentration in the water can increase rapidly due to rain, debris or bather load. Results in a minute!  For a clean and healthy pool, test the water at each end a minimum of twice a week!

*Phosphate product only available in US.