Due to the rounded particles and the reduced weight of the material, Geo fill® civil engineering bulk fill has a wide number of applications and has been used successfully for many years as backfill and drainage material. Geo fill® is considered for use as an alternative to ‘normal’ weight aggregates in series 500 and 600 of the Specification for Highway Works. Because of the particle shape and porous nature of the Geo fill® material it is free draining, allowing water to pass through rapidly. It also has a relatively high absorption allowing it to soak up excess water quickly, returning it slowly to the surrounding area. Used as a Drainage media, the particle size and shape of Geo fill® gives it excellent hydraulic conductivity properties.