American Hydro Systems RR2 Rid O' Rust Extreme Water 2X Concentration Stain Preventer， 1/2-Gallon Bottle</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>New 2X formula is twice as strong as original Rid O' Rust formulas</li><li>Prevents ugly rust stains and scaling from well water</li><li>Use in place of Rid O' Rust Formula 1000 and Formula 3000</li><li>No.1 Selling rust preventer in the US</li><li>Ready to use formula</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/414R7dSGE7L.jpg' noproxy></br>