Following SQIDEP’s 5.2 Framework for Reporting, you must submit catchment characteristics including grade & land use type, including photos. Also, PSD’s (particle size distribution) for influent and effluent must be submitted as per 5.2.h.
For example, Page 4 of the SPELFilter SQIDEP Evaluation Report shows that the land use is light industrial and considered to be representative of generating typical pollutant.
These clauses are designed to exclude a claimaint from picking a site such as a rainforest or beach front with lots of organic matter, or coarse sand/sediment, or a heavy vehicle yard with abnormally high loadings. These are not typical sites and will result in artificially high device performance.