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Before and After

Eff Off applied to new build brick work.

Product description

EFF OFF™ is an acid free efflorescence remover, which contains a blend of organic compounds, surfactants and activators.

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.


  • 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. 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.


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). 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.


Remove as much product as possible from application equipment and clean tools and equipment immediately after use with soapy water.


Read all precautions / instructions before use. DO NOT DILUTE. PRODUCT IS SUPPLIED READY TO USE. Do not allow to come into contact with plants, shrubs or grass. Keep away animals and pets until cleaning process is complete and surface is dry.


For Health & Safety instructions, first aid measures, spillages and disposal instructions, see separate Health & Safety Data Sheet (MSDS).


Store securely in the original unopened container. Shelf life 24 months from the date of manufacture. Keep in a dry place between 5ºC and 30ºC.


Product Data Sheets

EFF OFF Safety Data Sheet

Important Information

Hard calcium deposit

Image of steps shows an example of hard calcium deposit Not Efflorescence.

Product FAQs

What is efflorescence

Efflorescence is a crystalline, salty deposit that can occur on the surfaces of bricks, masonry, concrete and other mineral based substrates. It is generally a white or off-white colour with a powdery appearance.

What causes efflorescence?

Efflorescence is caused by water vapor migrating through the substrate, bringing the soluble salts to the surface.

Is efflorescence a mould?

Mould grows, efflorescence doesn't. Mould can grow on just about any surface, whereas efflorescence doesn't spread. Mould is a fungus, whereas efflorescence is moisture that once evaporated leaves visible salt deposits.

Is efflorescence harmful to humans?

It is common for people to confuse moulds with efflorescence, whilst unsightly salt deposits are not dangerous or harmful.

Will efflorescence return after I’ve used EFF OFF™

If applied as instructed efflorescence is unlikely to return however to ensure permanent solution, sealing the surface from water penetration (using a penetrating sealer) will help prevent any further efflorescence.

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