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

💧Dilutable Concentrate for Cost Efficiency

🧪85% Food Grade Purity

⚙️Effective Rust Removal & Metal Etching

₩102175

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Description

⚡ Transform Rust Into Resilience with Duda Energy!

RUST BE GONE - Dissolves rust and leaves a protective phosphate coating to prevent future corrosion—your metal’s new best friend.
PURITY YOU CAN TRUST - Certified low contaminants (arsenic, cadmium, lead) for safe use in sensitive applications—no compromises on quality.
ULTRA CONCENTRATED POWER - 85% food-grade phosphoric acid ensures maximum effectiveness with minimal volume—save money and storage space.
SAFETY FIRST RESULTS ALWAYS - Handle with care using gloves and eye protection; sealed packaging keeps it secure and ready for your next project.
VERSATILE INDUSTRIAL STRENGTH - Perfect for rust removal, metal cleaning, biodiesel processing, and pH adjustment—one bottle, endless uses.

Duda Energy’s 1 Quart 85% Food Grade Phosphoric Acid is a high-purity, multi-purpose acid concentrate designed for powerful rust removal, metal cleaning, and industrial pH adjustment. Certified to meet Food Chemical Codex standards with minimal contaminants, it offers superior performance and cost efficiency for professionals seeking reliable, versatile solutions.

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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₩102175

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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Asin	B06Y1B82TG
Date First Available	May 14, 2014
Item Model Number	Fgphos-new
Manufacturer	Duda Energy
Package Dimensions	10.6 x 4.53 x 4.49 inches; 3.63 pounds

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

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Details

Description

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Common Questions