Phosphoric Acid 75% - 15 Gallon Carboy - Uses: PH Control and Adjustment, Corrosion Inhibitor, Activating Agent, Personal Care, Pharmaceutical, Agriculture - Made in America - Alliance Chemical

takes rust off no problem

50/50 ratio with distilled water works great as rust preventative when storing bare metal.

Fresh H3PO4 package as described.

Bought this to dissolve solid mortar ,stopping up a tub p trap under ground, and deep under the tub, due to thoughtless tile contractor. Would have cost thousands of dollars to demo, rebuild, and remodel. Left for 7 days. Snaked line . Broke up mortar, and unstopped drain. Was in shock. Happy, but shocked. It did the job. Very happy customer, and Contractor. Love the giant container.

to stop rusting on my building. It worked great. BUT you shipped me 6 bottles instead of 2. How do i return 4 bottles and get my money back? WTF ? Please help