Kent Marine pH Control Minus for Aquarium</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Safely raises ph of tap or aquarium water when used as directed</li><li>Many electronic ph pens and probes drift over time and frequent calibration with a good test kit is strongly recommended</li><li>The use of a good ph test kit is absolutely necessary while using this product</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/515pAW6%2BsaL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51i6RRytnOL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51PNWmnokfL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51vzkHQZq0L.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/31pjbcswQUL.jpg' noproxy></br>