In depth filtration, liquids are forced through the three-dimensional matrix of the sheet. It is within this matrix that the particles are trapped. Depth filters are most often used in applications with higher dirt loads where other "surface" filters do not provide sufficient life. Depth filters typically have a thickness of 3 - 4 mm which is 3000 - 4000 times the size of a 1 micron particle thus enabling the entrapment of millions of microparticles in every square metre of filter area.

Carlson filter sheets series of depth filter sheets comprises a complete range of products tailored specifically for applications where purity and quality are paramount. From the removal of coarse matter through to sterilising filtration, there is a product ideally suited for all applications. All products are carefully formulated to provide particular filtration characteristics. Ongoing investment in manufacturing facilities, coupled with stringent quality management practices (backed up by conformance to ISO9001:2008), ensure consistent product quality. All "white" sheets are laser etched on the outlet / smooth side with grade and batch number for complete traceability; the production date is shown on the external packaging.