Leisure Time 45020 Free Biguanide System Test Strips<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Maintain biguanide sanitizer level between 30-50 ppm at all times.</li><li>For more than 25 years， Leisure Time has been the premier name in spa water care</li><li>4-way water testing strips</li><li>Free biguanide system test strips</li><li>Easy to use</li><li>Accurate spa water testing</li><li>Good for quick use</li><li>Test for sanitizer (free)， pH， total alkalinity， and calcium hardness</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51mVzqPqv5L.jpg" noproxy>