Harborlite Perlite is a high porosity filter media that is manufactured from perlite ore, which is an igneous mineral. When Harborlite Perlite is applied to the filter septum, it forms a low-density, highly porous filter cake that is ideal for separation in high solids applications. It is also ideal for the maintenance of filter cake permeability through the bodyfeed (addition) of the media upstream of the filter press, filter housing or vessel.The performance of your filtration equipment can be significantly affected by the media you choose and how often you clean your system.Perlite filter media improves your filter operation by pre-coating fast and effectively. Key Features Removes particles down to 1 micron Harborlite Perlite Media is low float Perlite and maximizes performance Enhances element coating Maximizes oil removal Removes up to 99.9% of crypto in a single pass Achieves 25-30% longer filter cycles (according to current Defender Filter operators). Perlite is all-natural and chemically insert Perlite backwashes quickly and completely saving you time Half the weight of traditional D.E.