The best work of the month

2 September 2016

How to clean the lava stone: the best job of the month of August

This month Marbec moves to Corsica for the treatment and cleaning of an outdoor lava stone pool.

Are you back from summer holiday? Or are you one of the lucky ones who are at the beach? In any case, the best job of the month is back. We didn’t go on vacation. In August we continued to follow the most beautiful works carried out with Marbec products. For the month of August we move to Corsica, where the Nettoie 2000 company has carried out the cleaning and treatment of a volcanic stone pool. If you are curious about how to clean lava stone, read on.

The black lady of natural stones

Dark, smooth, compact: volcanic stone or lava stone gives a touch of class wherever it is used. Its black color is very elegant and adapts to all contexts. Lava stone is also very resistant. Indeed, it is one of the most resistant stones in construction. Very often architects use it for street furniture, to create sidewalks, road pavements and even benches. Volcanic stone also gives a special touch in the gardens. In this article we will talk about the cleaning and treatment of a stone swimming pool carried out by the Nettoie 2000 company in Porto Vecchio, Corsica.

From the bowels of the earth here is the lava stone

Lava or volcanic stone is a natural stone. Unlike marble or other natural stones, it is not a limestone or a stone like cotto or porcelain tiles. Lava stone is an igneous or eruptive rock. These stones are formed by the solidification of magma, that is, the lava erupted from volcanoes. In reality, speaking of lava stone is very generic. Depending on the chemical composition, the way of solidification and the depth, there are many types of volcanic rocks. Granite and porphyry are two examples of stones of volcanic origin. The stone we will talk about today, however, is basalt. The chemical composition of the basalt gives this stone its very elegant dark color. Used in construction, this stone has several advantages:

  • High wear resistance
  • High resistance to friction
  • Classic and elegant character

These characteristics make it ideal for outdoor use as the lava stone lasts a long time. However, attention must be paid to limescale stains, construction site residues and organic encrustations. These aggressive agents can dull the surface and make it unsightly. Look at this photo: a bad effect, right?

Il fondo della vasca incrostato di calcare e residui organici

How to clean the lava stone?

Here is how a company specializing in the cleaning of lava stone carried out the treatment of this pool covered in lava stone.

First step: remove limescale deposits

The first step in cleaning the lava stone of the pool was to remove the limestone deposits.

Pulizia della pietra lavita con Delicacid, pulitore acido delicato
This pool had residues from the joints left on this pool. The workers who had laid the cladding slabs had done a bad job, and the result was unsightly white spots on the surface. In addition, the water of the pool had whitened the elegant black stone, leaving a patina of limestone that had opacified the surface. Nettoie 2000 operators used Delicacid, a mild acid cleaner. Delicacid is safe because it does not contain dangerous substances such as hydrochloric acid. It does not produce fumes or other toxic vapors, and can be used safely with pressure washers and other machines for cleaning large surfaces. Delicacid is respectful of the stone. It was designed for much more delicate stones than volcanic stone, such as cotto or marble. But, since it is such an elegant pool, the Nettoie 2000 technicians did not want to risk using aggressive products and therefore chose Delicacid. Nettoie 2000 technicians poured on a synthetic pad and passed it by hand over the surface. To perform this operation you need little force: the action of the acid is sufficient to remove the limescale. By acting in this way, it took little to remove all the limestone residues. A good rinse, and the stone is dark again. By the way: have you seen the view?

Second step: remove organic residues

Where there is water there is life. We know, it’s a banality. But this is the reason why the lava stone of the pool was covered with organic residues. We have repeatedly talked about how various types of microscopic plants create an ugly patina on the natural stone, where they find an environment for growth. While cleaning the lava stone from organic residues, a detergent such as UNIPUL is fine. Unipul is a neutral ph degreasing detergent. What does it mean?

All substances have a value called ph which determines how acidic a substance is. A substance with a neutral pH, on the other hand, is in the middle of the scale and does not interact with the material with which it comes into contact. Unipul was also hand-passed by the Nettoie 2000 technicians. The degreasing effect removed all organic residues from the surface. Here too, after rinsing and drying, the stone has returned to its splendor, ready to be treated.

Third step: giving a tone to the lava stone

Now that the lava stone surface has been cleaned of limestone and organic residues, the Nettoie 2000 technicians intervene by passing over an impregnating product. OILWET is perfect for this: it is a professional product. It can be diluted in various proportions depending on the effect you want to achieve. Oilwet leaves a pleasant wet effect on natural stone surfaces. But it doesn’t just do that. Oilwet guarantees a protective layer to the stone, preventing water and coloring substances from penetrating inside. As we have said, Oilwet must be diluted with DILUOIL solvent. For this pool, the operators of Nettoie 2000 used Diluoil, an odorless diluent product specially designed to dilute the products and diluted Oilwet to 60%.

Applicazione del tonalizzante impregnante

The Nettoie 2000 technicians knew how to do it but when you go it alone, it is best to seek supervision or leave it to an expert. In fact, Oilwet must be dosed with care. As it is a professional product it has been designed to be extremely efficient. Care must be taken not to pour too much because it could leave residues that could be difficult to remove later.

See how Oilwet repels water?

The result

Here, from these photos you can see the result. The lava stone, which had been whitened by the stay outside, by the limestone and by the neglect of the installer, has returned to its beautiful black color like coal.

Effetto bagnato finale
What about your volcanic stone?

Do you also have external volcanic stone cladding? Would you like to clean it and you don’t know how to do it? Have you found a method you want to share? Email us or post a comment on our blog.

The best work of the month of August

The company

Nettoie 2000 S.a.r.l. by Sauveur Fancellu rue Zoe Grimaldi Ortoli 20137 – Porto Vecchio Corsica – FRANCE +33 49 57 02 935 Official website of Nettoie 2000 S.a.r.l.


Cleaning and treatment of a lava stone pool.

The products used

  • DELICACID: multifunctional acid cleaner for lava stone.
  • UNIPUL: concentrated universal sanitizing detergent.
  • OIL WET: solvent-free wet-effect toning protective for lava stone and stone materials.
  • DILUOIL: odorless aliphatic diluent product for diluting products in solvent.

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