Efflorescence has been one of the most common problems in concrete. It appears to be a white fuzzy stain often seen on walls and floors. This white, crystalline material is made up of mineral salts dissolved by water. Though it is generally not a risk to safety, it affects the visual appearance of the concrete.
If you noticed efflorescence on your walls, it means you have a moisture or leakage problem. If not fixed immediately, it can lead to concrete spalling and deterioration.
How to clean Efflorescence
Remember, painting the concrete does not solve the issue. It only covers up the white stain. Here are some cleaning techniques to remove efflorescence on concrete:
- Wire brushing
- Acid washes (muriatic acid, baking soda, vinegar or citric acid)
- High pressure water jet or sandblasting
How to prevent Efflorescence
Efflorescence can be controlled with the following methods:
- Check for cracks and holes that may be a possible entry point for moisture. If cracks and holes are sighted, have it sealed immediately.
- If the entry ways of moisture is not visible, get a waterproofing professional to apply the suitable concrete waterproofing membrane.
- Using a moisture metre, check and ensure that moisture content of concrete is less than 10%.