What Causes Efflorescence on Concrete?

The staining caused by efflorescence on concrete can be more than unsightly, it can be a sign of an underlying problem. Being aware of the potential causes of the white deposits can help you to determine the best removal method to use.


One of the main components involved with the formation of efflorescence on concrete is water. Whether the water seeps out from within the concrete after having found its way there during the manufacturing process or it is applied externally, both situations can result in efflorescence. A leak or penetrating damp can cause the problem.


Water helps to cause the problem of efflorescence on concrete due to the fact that it reacts with chemicals in the concrete. The water dissolves the salt which then flows to the surface where the water evaporates to leave salt deposits, which appear as a white bloom.


The manner in which efflorescence affected concrete is cleaned depends on the severity of the problem and the reason for the occurrence. Minor instances of the problem can be cleaned by dry brushing with a stiff bristled brush, while severe cases will need to be treated with a suitable acid solution. In the cases of a leak and damp, it is prudent to rectify the problem first.