Black Swan 09017 20%-Muriatic Acid, 28%-Hydrochloric Acid, 20°-Baume - Used to Etch Concrete Floors and Walls Prior to Painting, Cleaning Brick and Cement, Removing Rust Stains from Toilet fixtures

This thing is REAL!! If you have problem with accumulation in your toilet bowl , trust me , take it. Do not put too much and make sure to wear mask and open window. It is a STRONG smell that 'kills' everything around. But it works. A bit of high price, but what can you do ? Sometimes you have to pay to get it done.

I believe this is hydrochloric acid. Be careful it works great but be mindful. It will take of skin if exposed too long and It will be tough to breathe while working with it. I recommend a good face mask.

Gran ayuda para mantener todo limpio.

Este producto limpia superficies muy sucias, bueno en si, pero de muchísimo cuidado , hay que usarlo con guantes mascarilla y gafas protectoras ,no dejarlo mucho tiempo porque quema la superficie,en conclusión altamente peligroso

less expensive than pool store and works well

To remove rust from toilet bowls and tanks this product worked great. Even with the extremely hard water of my Las Vegas location. Giving the acid a few hours to work produced excellent results. The bottle will allow two or three treatments of both the tank and bowl. Very satisfied and have reordered.

Lowered my ph level

At least it was in plastic bag but the bag wasn't sealed so it leak in and out of the shipping box. Use caution.