Spa Choice 472-3-5051 Alkalinity Up for Spas and Hot Tubs， 1-Pound<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Maintaining a desirable total alkalinity reading is critical to holding chlorine residuals</li><li>pH levels are easier to control with a corrected total alkalinity</li><li>Alkalinity acts as a buffer， improving the ability of your pool water to resist pH fluctuations</li><li>Downloadable User Guide Available Under Product Information: Technical Specifications</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31yQoct-M5L.jpg" noproxy>