Air, water and a blasting agent are set in rotation through a turbine. When the rotating mixture of air, water and blasting agent reaches the surface of the building material, a tangential abrasion effect takes place. The particles of the blasting agent slide along the surface  instead of being “shot” directly.

The removal of dirt is exceptionally gentle, deposits of soil can be gradually removed and the degree and intensity of cleaning can be freely selected.

WHIRL JET TECHNIQUE

Range of use and properties Typical substrates are natural stone, render, brick and concrete. Superficial soiling as well as crusts, coatings and graffiti can be removed.

The procedure is suitable for historically valuable surfaces as well as for “normal” facades.

This cleaning procedure is very gentle to the substrate because of its flat impact angle, tangential abrasion effect, ability to select a suitable blasting agent and because of the infinite variability of the blasting pressure – between 0.1 to 10 bar

Because of its tangential movement, the blasting agent remains on the surface for longer intensifying the cleaning effect and therefore the surface area output per hour (up to 30 m2/h). Less blasting agent is needed (up to 50% less) and costs for disposal are minimal.

The Whirl Jet Technique is gentle to the environment and facade of the building by minimising the quantity of water used (this also reduces standing time).

Below are a number of buildings the whirl jet system has been used to clean;

Westminster Palace (natural stone)

O’Connel Street Statues (natural stone)

Portsmouth University (natural stone)

Lichfield Court (concrete)

Americian Embassy (concrete)