Removing Efflorescence from Concrete Block Walls

White efflorescence stains on concrete block wall.
White efflorescence stains on concrete block wall.

Before sealing a concrete block wall, it’s important to remove any white efflorescence using an efflorescence remover such as QUIKRETE Efflorescence & Rust Remover.

Once the wall has been cleaned, apply a waterproofing sealer to prevent more moisture from coming through the wall.

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Further Information

Waterproofing basement walls is a great way to reduce the infiltration of moisture into these spaces. But before you apply a sealer, it’s important to remove any efflorescence from the block wall.

A water based efflorescence remover is more effective than scrubbing the surface and requires less work. Once the surface is clean, you can apply a waterproofing sealer to prevent any more water from migrating through the wall.

These tips brought to you by Quikrete Cement and Concrete Products. It’s what America’s Made Of.


  1. I have what looks like a bad case of efflorescence from a cinder block wall. I’m about to follow your advice and both clean the wall and then seal it with your waterproof product. My hesitation comes from the fact that the ‘efflorescence’, if that’s really all it is, has actually slightly damaged the cinder block. There are several soft spots on the wall, and scrubbing those places can cause an indentation of 1/4 ” or more. I can’t see how cleaning and sealing will stop further degradation.

  2. Can the inside of the cinder block be sealed against effervescents. I have soil against the outside wall which would be alot of work to remove. Thanks, RD


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