Author: waterfiltech

Filter sheets are made in the same way as paper, i.e. by wet laying, but they are both thicker than paper and rougher in texture. They have traditionally been used…

Paper is made by the wet laying of a mass of cellulose fibres onto a woven wire band, which is effectively a filter through which the water drains and the…

The previous part of this Section covered processes that dealt with filtration in a minor way, but which were not primarily intended for the separation of particles from fluids. The…

First to be considered in this review of filter media are three types of material whose prime function is not the separation of solid particles from fluids, but in whose…

The industrial context within which filter media are made and supplied to their endusers is of more than passing interest. The great variety in which media are made leads to…

A filter medium is any material that, under the operating conditions of the fi lter, is permeable to one or more components of a mixture, solution or suspension, and is…

All gas phase filter tests are of the single-pass format using a particle challenge, but the methods differ widely, as do the particle formulations used in the challenge and the…

The test circuit used for fatigue tests subjects the filter to start-stop cycles (for evaluating fatigue behaviour under otherwise steady flow conditions), or to cycles of pressure fluctuation (for evaluation…

A range of methods exists for testing various aspects of a filter ’ s performance. These will be briefly discussed here, although a more complete review of test methods and…

A steady flow of fluid through a filter will cause correspondingly steady accumulation of solids and rise in pressure drop. The effect of pulsating flow is to loosen the finer…