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.

Perfect for cleaning marks on pool liners. Be sure to wear a mask and gloves.

Excellent for crafting with shells

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

Received the product in a timely manner. Works well for my purpose.

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.

I had calcium build up in my toilet and this cleaned it up.

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.