Strong water , also known as salfumán or hydrochloric acid In concentrations between 32 and 35%, it is one of the most powerful cleaning and treatment products available in the professional field.
Its ability to dissolve mineral scale, remove rust, and clean extremely dirty surfaces makes it a key ally in sectors such as construction, hospitality, industrial maintenance, and pool treatment.
In this guide we are going to explain:
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What is strong water (hydrochloric acid) and why is it so effective?
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All its professional uses (some very little known).
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Precautions for safe handling.
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Practical tips for getting the best results.
What is strong water or hydrochloric acid?
Strong water or salfumán is an aqueous solution of hydrochloric acid (HCl) in high concentration, generally between 32 and 35%.
This inorganic acid appears as a clear or slightly yellowish liquid, with a very characteristic and intense odor.
Thanks to its extremely low pH and high reactivity, hydrochloric acid has the ability to react with minerals, oxides, and other substances that are difficult to remove with common products.
Due to these properties, etching water is mainly used in professional tasks where high descaling and cleaning power is required.
Professional uses of strong water (hydrochloric acid, salfumán)
Eau de toilette is used in a wide variety of sectors and applications. Below, we detail the most common and effective uses:
1. Cleaning of construction debris
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Removal of cement, mortar, plaster and lime residues adhering to floors, walls and facades.
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Cleaning of stoneware, porcelain and stone surfaces after installation.
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Dissolution of white efflorescence (mineral dust on surfaces).
2. Descaling and tartar removal
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Cleaning of mineral deposits and scale in boilers, pipes, appliances and hydraulic systems.
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Use in industrial plants to maintain the good condition of machinery and pipes.
2.3. Pool treatment and maintenance
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Cleaning rust stains and mineral deposits on walls, stairs and metal fittings.
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Removal of mineral-encrusted waterline.
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Control and adjustment of water pH (professional use).
2.4. Metal cleaning and preparation
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Rust removal from tools, metal structures and industrial parts.
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Surface preparation for galvanizing, welding or painting processes.
2.5. Industrial maintenance
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Deep cleaning of machinery, tanks and systems in industrial plants.
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Unblocking pipes clogged by mineral residues (controlled application).
2.6. Cleaning toilets and ceramic surfaces
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Descaling toilets, urinals and sinks with mineral deposits.
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Removing tough stains from tiles and hard floors.
2.7. Restoration and cleaning of facades
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Removal of stains caused by pollution, fungi, mold, or atmospheric residues on stone, brick, and concrete.
2.8. Other specialized uses
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Neutralization of alkaline solutions in chemical and water treatment processes.
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Engraving and texturing of surfaces before applying coatings.
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Cleaning in food, mining and chemical industries (with strict protocols).
Where to buy professional quality eau de toilette?
At La Corberana , we specialize in the manufacture of chemical products for professional cleaning and maintenance in Spain , including 32–35% hydrochloric acid of the highest purity and certified quality.
We offer expert advice for proper handling and application in every sector. Our commitment is to provide safe, effective products and personalized service for companies and industries that require reliable solutions.
If you want professional results and a trusted supplier, contact us and discover why La Corberana is a leader in professional cleaning products in Spain .
How to handle strong water (hydrochloric acid) safely
The use of strong water requires extreme precautions due to its corrosive nature and its ability to generate irritating vapors:
Mandatory protective equipment
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Chemical resistant gloves (PVC, nitrile).
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Safety glasses or face shield.
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Waterproof work clothes or chemical apron.
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Mask in closed or poorly ventilated spaces.
Basic application rules
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Always dilute the acid in water, adding the acid to the water and never the other way around to avoid violent reactions.
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Apply with acid-resistant utensils (brushes, sprayers).
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Leave to act for a maximum of 5 to 10 minutes to avoid damaging surfaces.
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Rinse with plenty of water after treatment.
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Avoid mixing with bleach or hypochlorite products, as this may produce toxic gases.
Additional precautions
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Do not use on marble, polished granite, aluminum or zinc, as it may damage them.
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Keep the product stored in its original packaging, tightly closed, and out of the reach of children and pets.
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Ensure adequate ventilation in closed spaces during use.
Advantages of strong water over other cleaning products
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Cleaning and descaling power far superior to mild acids or common cleaners.
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Fast action and visible results in just a few minutes.
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Versatility for multiple sectors and surfaces (always respecting the instructions).
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Very favorable price-quality ratio for professional uses.
Frequently asked questions about strong water and salfumán
Are strong water and hydrochloric acid the same thing?
Yes, in Spain the term salfumán is commonly used to refer to diluted hydrochloric acid, generally around 23–25%, while aqua forte usually has a higher concentration (32–35%), intended for professional use.
Can I use strong water to clean stainless steel?
Not recommended, as it can cause corrosion. There are more suitable specific products for this material.
Is it safe to use strong water indoors?
Yes, as long as good ventilation is ensured and all the indicated protective measures are taken.
Can I mix strong water with other products?
Never mix strong water with bleach or other hypochlorite products, because the reaction generates toxic and dangerous gases.
Can it be used to clean wood or textiles?
No, strong water can irreparably damage these materials.