I heard I should use Phosphoric acid to etch grout before applying a sealant. Would this product be good for that?

using Phosphoric acid on grout will basically erode or eat away a very fine layer of grout. this opens the pores and gives the grout more bite for the color seal to bond. When grout cures after installation, it gets almost like a skin on the surface from settling, or at least a tighter surface tension. When you hit this with Phosphoric acid, it opens it up and makes it slightly rougher. If you don't color seal, it will make it more prone to staining in the future. It doesn't always need to be done, but it will help the color seal bond.

Can I use this on rusty kitchenware? Like pots and pans,?

This can be used as a rust remover. Be sure to use gloves! Great for cleaning residue from metals.

Can I clean the rust from cast iron cooking pans with this? It says it has an inhibitor that remains behind, so I wasn't sure if it would be safe.

USE POTATO AND COURSE SALT TO CLEAN CAST IRON. but FIRST !!! PUT IT IN A RED HOT CAMP FIRE COALS AND BURN IT OFF BEST WAY!!! THEN AFTER IT COOLS OFF ENOUGH TO NOT CATCH THE VEG OIL ON FIRE WHEN YOU APPLY IT TO THE CAST IRON. BEST results! you can use charcoal also

I use a bathroom cleaner that contains 3.5% phosphorus acid. Is this product suitable for diluting to 3.5% with water for use as a bathroom cleaner?

Yes, diluted phosphoric works well as a lime and hard water deposit remover for concrete, tile, and other stone surfaces.

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Duda Energy 1 Quart / 950ml 85% Food Grade Phosphoric Acid Rust Remover Clean Etch Metal

Product ID: 40824609

Details

Brand
Duda Energy
Item Form
Liquid
Item Volume
950 ml
Scent
Sour
Specific Uses For Product
Drain

🧪85% Food Grade Purity

⚙️Effective Rust Dissolution

🛡️Phosphate Coating Protection

S$93

Duties & taxes included

In stock

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Description

🧪 Transform Rusty Metal Into Pristine Powerhouses – Don’t Let Corrosion Win!

POWERFUL RUST REMOVER - Dilute and soak to effortlessly dissolve rust and restore metal brilliance.
VERSATILE INDUSTRIAL USE - Ideal for biodiesel processing and precise pH adjustments beyond rust removal.
CERTIFIED LOW CONTAMINANTS - Guaranteed purity with minimal heavy metals for safe, reliable application.
LONG LASTING RUST PROTECTION - Leaves a phosphate barrier that actively inhibits future corrosion.
PREMIUM 85 FOOD GRADE PURITY - Meets strict FCC standards for unmatched safety and performance.

Duda Energy’s 1 Quart 85% Food Grade Phosphoric Acid is a high-purity, multi-functional rust remover and metal cleaner that meets Food Chemical Codex standards. It effectively dissolves rust while leaving a protective phosphate coating to prevent future corrosion. Trusted for industrial and automotive use, it also serves in biodiesel processing and pH adjustment, backed by certified low contaminant levels for safe handling.

Specifications

ASIN	B06Y1B82TG
ASIN	B06Y1B82TG
Best Sellers Rank	#21,361 in Automotive ( See Top 100 in Automotive ) #114 in Care Corrosion & Rust Inhibitors #1,028 in Oils & Fluids #3,383 in Paint, Wall Treatments & Supplies
Brand Name	Duda Energy
Container Type	Bottle
Customer Reviews	4.8 4.8 out of 5 stars (233)
Date First Available	May 14, 2014
Item Form	Liquid
Item Volume	950 ml
Item Weight	3.6 pounds
Item model number	Fgphos-new
Manufacturer	Duda Energy
Manufacturer	Duda Energy
Model Number	Fgphos-new
Number of Items	1
Package Dimensions	10.79 x 4.69 x 4.41 inches; 3.63 pounds
Part Number	Fgphos-new
Scent	Sour
Size	1 Quart / 950ml Bottle
Special Features	Rust Resistant
Specific Uses For Product	Drain
Surface Recommendation	Metal
UPC	840194133708
Unit Count	32.1 Fluid Ounces

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TrustScore 4.5 | 7,300+ reviews

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