Author: waterfiltech

The permeability is the reciprocal of the resistance to flow offered by the filter – thus, high permeability represents a low resistance and vice versa. Permeability is usually expressed in…

One especially important case of purification concerns the removal of microbial contaminants so as to produce a sterile fluid. The use of membranes of 0.2 um rating is generally regarded in…

The nominal rating of a filter can be expressed by means of this efficiency figure. Given as a percentage, it can be calculated from the beta ratio, or directly from…

The beta ratio is a rating system introduced with the object of giving both filter manufacturer and filter user an accurate and representative comparison among various filter media. It is…

A mean filter rating is a measurement of the mean pore size of a filter element. It is far more meaningful than a nominal filter rating, and, in the case…

A nominal rating is an arbitrary value for the performance of a filter, determined by the filter manufacturer, and expressed in terms of percentage retention of a specified contaminant (usually…

Given that a filter may not be able to remove all of a suspended solid, there will, nevertheless, be a particle size cut-off point above which no particle should be…

Filters are rated according to their ability to remove particles of a specific size from a fluid suspension. There are many different methods in which performance may be specified in…

It has been stated that a filter medium is a porous (or at the very least semipermeable) barrier placed across the flow of a suspension to hold back some or…

The basis of the particular mechanical separator that is called the filter is the placing across the fluid flow of a barrier, the filter medium. This acts like a porous…