Filter using a powder-like substance consisting of tiny prehistoric diatom skeletons, which are very porous and make excellent filter media. Replace D.E. each time filter is cleaned.
Diatomaceous Earth Filter. A filter designed to use diatomaceous earth (D.E.) as the filter medium. The D.E. is added through the skimmer with the pump on, which takes the D.E. and deposits it on a grid. The D.E. then becomes the filter medium.
Filter medium made up of Diatomaceous Earth settled on a screen like grid.