How to remove efflorescence on rendered wall?

[liverbird]

Hi All,

This looks like efflorescence but just wanted to check what is it and how to get rid of it and prevent it from happening. This is just on two of the four sides of the wall.

 

[JacobZ]

Hi @liverbird,

A warm welcome to the Bunnings Workshop community, it is fantastic to have you with us. 

Unfortunately, as efflorescence happens when natural salts present in masonry materials is absorbed by moisture passing through and is deposited on the surface when it dries, long as the pillar is exposed to the elements, there isn't a great way to prevent efflorescence from recurring and the best course of action is to clean and manage it when it shows up.

I'd suggest grabbing some Crommelin 4L Efflorescence Remover to clean the efflorescence.

Mix it in a ratio of 1 part cleaner to 1 part water and apply it to a test area. Allow the visible reaction to stop and then flush with water. If the test is successful, you can follow the same process with the rest of the pillar until all of the efflorescence is removed.

Keep the remaining efflorescence remover in case it reappears.

Let me know if you have any further questions. 

Jacob