Rendezvous Spa Specialties Ph Down 1 Lbs<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Lowers the pH of spa water</li><li>Compatible with bromine， chlorine， salt water， ozone， minerals and biguanide sanitizing systems</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41jxLfURJLL.jpg" noproxy>