American Hydro Systems RR1 Rid O' Rust 2X Concentration Stain Preventer， 1/2-Gallon Bottle<div style="text-align: left;"><strong>[Product Information]</strong><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 500 and Formula 2000</li><li>No.1 Selling rust preventer in the US</li><li>Ready to use formula</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41apvnhbXQL.jpg" noproxy>