Unlike most other efflorescence removal products EFF OFF™ is free from caustic acids, (most are hydrochloric or sulphuric) and removes the surface salts. The active components combine with salts in the substrate and renders them soluble in water, this removes efflorescence and prevents the cycle from continuing. EFF OFF™ can be used on bricks, masonry, render and concrete. It is also safe to use on terracotta, porcelain, granite, marble and almost any mineral based hard substrate.

EFF OFF™ efflorescence remover is a blend of synergistic organic compounds, surfactants and activators. It not only removes the surface salt but also penetrates deep into the pores. The active components overwhelm the salt deposits and renders them soluble in water. This removes efflorescence and prevents the cycle from continuing.

EFF OFF™ will not work on hard deposits that do not dissolve with water or easily brush off the surface. For extra protection, seal with a protector from the GK range.


  • Do not dilute, product is ready to use
  • Always carry out a test to ensure the finished result is acceptable before commencing with the whole area
  • Before application remove grease, dirt, all loose and flaking material.
  • Apply a saturated coat at a rate of 5m² per litre by brush or garden sprayer and brush in vigorously.
  • Leave to dwell for 1 hour and repeat process.
  • Leave for up to 24 hours.
  • Rinse off with a stiff brush or power jet and leave to dry (a weak dilution of 50 parts to 1 part EFF OFF as part of the rinse water is recommended).
  • Once dry, the surface may be treated with an appropriate sealer.
  • Remove as much product as possible from application equipment. Clean tools and equipment immediately after use with soapy water.

Efflorescence or hard calcium deposits?

These require very different treatments.

Efflorescence it typically seen as white deposits on brickwork, but can also occur on concrete and masonry surfaces. As water migrates through the capillaries of the brick, it can bring with it soluble salts (calcium, sodium, potassium hydroxide and sulphates). When these salts reach the surface, the water evaporates and leaves visible salts behind which appear as soft white deposits. Efflorescence significantly affects the appearance of surfaces but is generally not a risk structurally. EFF OFF will treat efflorescence in a gentle efficient way - unlike other caustic products it won’t damage or dissolve the substrate, whereas the use of strong acid cleaners can result in further efflorescence problems. 

Calcium deposits are denser than efflorescence and usually present as white streaks running down a surface. Once allowed to harden they will be difficult to remove with EFF OFF. If the problem is hard calcium deposits, this will require an acid solution to dissolve and remove as they are not water soluble.

A simple guide to tell the difference and determine the correct treatment: efflorescence will darken (and possibly appear to disappear) when splashed with water; the appearance of hard calcium deposits is not affected with water saturation.

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