Removing Efflorescence from Concrete Block Walls

By: Guest Post
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.

This tip brought to you by:

Further Information

Video Transcript

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.


Please Leave a Comment

4 Comments on “Removing Efflorescence from Concrete Block Walls”

You can follow comments to this article by subscribing to the RSS news feed with your favorite feed reader.

  • Tony Says:
    August 11th, 2018 at 4:47 pm

    How do you remove effervescent after the block has been painted?

  • Roger Dorn Says:
    October 13th, 2017 at 7:36 pm

    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

  • Gary Grisham Says:
    May 16th, 2017 at 11:05 am

    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.

  • Ed Mikula Says:
    April 19th, 2017 at 9:30 pm

    how do you remove hard water stains (white residue) from concrete or cinder block walls? thanks

We want to hear from you! In addition to posting comments on articles and videos, you can also send your comments and questions to us on our contact page or at (800) 946-4420. While we can't answer them all, we may use your question on our Today's Homeowner radio or TV show, or online at

 characters available

Removing Efflorescence from Concrete Block Walls