Just dip an AquaChek White Salt Water Titrators strip in your pool or spa water for one second, and remove it immediately. You get test results in seconds! The AquaChek White strips will give you a specific reading of the salt level in your water. With our unique titator, test the level of Salt as Sodium Chloride. Maintaining as ideal level of salt will allow your chlorine generator to operate efficiently. To keep your pool at its best, test at least twice a week, and test your spa before each use. It's also a good idea to write down your results each time you test, so you can track changes. 10 Strips per bottle.