Whatman ashless filter aids enhance filtration speed by coagulating precipitates or suspensions to form a thick retentive ‘prefilter’ layer on top of normal filter paper.

Easily dispersible, the powder is of a purity similar to that of Whatman ashless quantitative papers. Maximum ash content is 0.015%. It is supplied with a two ended scoop for measuring 0.50 g or 2.5 g quantities.

Cell Debris Remover, a specialized filter aid for clearing cell lysates, is described separately.