Removes lime and carbonate efflorescence from block paving, concrete and engineering brick. For heavy deposits dilute it 1:1 with water, for extreme ones use it neat; one litre covers 2-6 m². It is an acidic product (pH approx. 2) - keep it off metal, render and painted coatings.
Block pavingD-2W is an acidic cleaner that removes lime and carbonate efflorescence - the white bloom that appears on paving, concrete and engineering brick as water evaporates.
Efflorescence is alkaline, so it is removed with an acid - an alkaline cleaner will do nothing here. Coverage 2-6 m² per litre, pH approx. 2.
Keep it off metal, galvanised and painted coatings, render and absorbent materials. Dilute 1:1 for very heavy soiling and use it undiluted for extreme soiling.
The usual reason a sealing job fails is not the product but the substrate. A sealer will not bond to a surface with grease, lime efflorescence or an old coating on it.
New paving has to season first - usually around 28 days from the date the block was made. You will find the exact time for each product in its technical data.
Before sealing the whole area, test on a patch hidden by a planter or in a corner of the patio. The same product can read differently on two batches of the same material, and on a surface with old coating left on it, it will not bond at all.
Only if you want it to. An invisible product leaves the colour alone, a wet-look sealer deepens it permanently, and a colour sealer gives it a new shade.
By how the water behaves. While it still beads on the surface, the treatment is working. Once water starts soaking in and dark patches return after rain, the protection has worn out.
No. Water occupies the pores the product is meant to enter, and stays trapped under the film. The result is often a milky bloom that cannot be removed without stripping the coat. The exceptions are the few products that tolerate slight surface dampness.
Not if you choose a penetrating product - it forms no film on the surface and does not change its grip. If the surface is already slippery, choose an anti-slip treatment rather than a sealer.
A 1:1 dilution is one part product to one part water - a litre of concentrate gives two litres of working solution. For extremely heavy soiling use it undiluted.
It can, as long as water keeps drawing salts up from the sub-base. So once the paving has been washed and has dried, seal it: D-2W removes the symptom, while sealing limits water uptake - the cause.
No, we advise against it. Hydrochloric acid dissolves the cement binder along with the efflorescence, washes out the joints and opens up the structure of the concrete, so the efflorescence returns sooner.
Enter the area and how absorbent the substrate is. We work out the litres and the packs.
Depending on how heavily soiled the surface is and on its texture.
Example for 45 m²
11.3L
Enter your own area to calculate for your job.
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