GK EFF OFF™ Efflorescence Remover 5Ltr

EFF OFF™ is designed to remove powdery efflorescence salt deposits from walls, paving, paths and block driveways. It neutralises and removes soluble salt contaminants and removes the salt as you clean the surface.

This granite and marble friendly solution contains an organic blend which aids the removal of chlorides, sulphates and salts – it dissolves and lifts the salt film back into solution so it can be rinsed away.

It’s important to confirm that your staining is water soluble efflorescence, EFF OFF™ will not treat calcium carbonate or other deposits which, require “dissolving”. See alternatives such as GK Concrete & Grout Remover. 

Not every "white deposit" on a wall is efflorescence!

Efflorescence is a powdery white, water-soluble salt deposit on surface masonry caused by moisture evaporation. As it passes through the wall, it collects loose salt and lime and brings them to the surface. As the water evaporates, the particles bond to the wall causing white chalk-like stains.

Calcium carbonate build-up (calcite/lime bloom) is a hardened, insoluble, crusty white deposit that bonds to the surface, resulting from long-term, deep-seated moisture penetration. Calcium carbonate build-up often indicates more significant, long-term water infiltration causing insoluble, solidified mineral deposits.

The key differences:

• Efflorescence often vanishes when wet or brushed away.
• Calcium carbonate is hard, dense, and typically requires dissolving by pressure washing, acid or grinding to remove – see GK Concrete & Grout Remover

Efflorescence dissolves or disappears when wet. Calcium carbonate remains visible and bonded to the surface when wet. While both are results of water and, in some cases, both result in calcium carbonate, they differ in age and structural impact on the surface material.

We recommend a “wet check” prior to purchase these simple tests will help determine efflorescence or another variety of white deposit.

Test 1: Primary efflorescence when rubbed with a finger will come off as a powdery substance

Test 2: Simply spray water on an affected area. If the stain disappears when wet and re-appears when dry, it may well be efflorescence. If the stain is still visible, it is unlikely to be efflorescence.