What grade of Terram Geotextile do I need?

TERRAM T1000GT standard geotextile is the most commonly specified separation & filtration geotextile in the UK and is fit for most but not all conditions. Ground conditions (type of soil, strength and permeability), type & size of aggregate fill, size of compaction equipment, traffic loadings (weight & frequency) will all affect the grade of TERRAM geotextile required. Please refer to TERRAM specification, design and installation guidance for more details.