Find your nearest stockist...
Just enter your Postcode below to find out your nearest stockists.
Patio Generator >
All concrete products may suffer the temporary phenomenon of efflorescence, caused by the migration of soluble salts to the surface. Efflorescence can sometimes appear as white powder, or just an apparent lightening or fading of colour. This is caused by the migration of soluble salts to the surface. The most common being calcium hydroxide which reacts with atmospheric carbon dioxide to form calcium carbonate – a white deposit of low water solubility becoming apparent as the surface dries.
Calcium Hydroxide Ca (OH)2
Removal of Efflorescence
Ideally it is better to let the phenomenon to disappear naturally, but it can be removed chemically by using proprietary acid washing agents or brick/patio cleaners in accordance with manufacturers instruction. Care must be taken and protective clothing must be worn.
It is not possible to predict precisely when, or if, efflorescence will occur as relatively minor changes in the quality of the concrete, the curing conditions and the environment can cause its formation.
Efflorescence is a natural phenomenon and one that does not affect the durability and performance of the concrete in question.