DIYChemicals Phosphoric Acid 85% – Rust Remover, Wood Stain Remover, pH Control, High Purity Orthophosphoric Acid for Metal, Fertilizers - Made in USA - Half Gallon (64 fl oz)

I needed a strong rust remover and this does a fantastic job of it. I used it on old rusted tools and machine parts. The rust was removed fully and quickly. Follow all safety warnings especially wearing gloves, eye protection, face shield and long sleeves. I mixed it with silica powder from Amazon to create a paste/gel and that works well for verticle surfaces

Perfect for mixing as a rust converter to the proper concentration

Good product for its purpose. Have not shopped for this item before so don't know it's full capabilities. Excellent rust and wood stain remover are some of the uses.

Good Acid

excellent product for cleaning concrete and rust removal

When they had arrived, acid had leaked all over the bottles.

Muy bueno para soldar con estaño incluso para inoxidable

DIYChemicals Phosphoric Acid 85% is excellent for hydroponics. It effectively lowers pH levels and is highly concentrated, so a little goes a long way. The packaging is secure, and the quality is consistent. A great value for growers who need reliable pH control in nutrient solutions. Highly recommended!