White Powder on Brick and Block

Where the mineral comes from

Masonry and mortar contain soluble salts. When water moves through the wall it dissolves those salts, carries them to the surface, and evaporates, leaving the mineral behind as a white crystalline deposit. The material was always inside the wall. What you see is the end of a journey, which is why a wall can be cleaned perfectly and bloom again after the next wet spell.

Why it is worst on new construction

Fresh masonry holds a great deal of construction moisture and has its full original salt content. New brick and block commonly bloom heavily through their first year or two and then taper off as the available salts are used up. On a new build this is normal rather than a defect, which is worth knowing before anyone alarms you about it.

Persistent efflorescence means water is getting in

If a wall keeps blooming years after construction, water is still moving through it. That points at a failed flashing, a downspout discharging against the wall, splash-back from grade, or a gutter overflowing onto the masonry. Cleaning the bloom without finding the water source is treating a symptom.

What removal can and cannot do

The surface deposit can be removed properly. What cleaning cannot do is stop it returning while water is still travelling through the wall, and aggressive acid washing can damage the mortar face and actually increase porosity, making future blooming worse. We will tell you when what you need is a drainage fix rather than a wash.