Removing Solids with Automatic Self-Cleaning Filters

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Introduction

The “art” of filtration utilizes many methods for separating solid particles from fluids. There is often no right or wrong method. Water quality and customer requirements usually determine the “best” method for each unique situation. Ridged screens, pleated cartridges, string wound cartridges, melt blown cartridges, woven fabrics, non woven fabrics, sintered metals, granular media, frizzy balls and membranes are just some of the types of filters available today. This plethora of filter types are often employed to do the same thing - remove suspended solids from a stream of water. This manuscript will concentrate on only automatic self-cleaning screen filters and their properties. Aside from all the advantages of screen filtration, one of the biggest hindrances to their use is their tendency to clog quickly and need for frequent cleaning. There are a number of automatic methods in practice to eliminate the need for labor when cleaning the permanent screens in this class of filter. However, some work better than others. This paper will discuss one type of automatic self-cleaning screen filter having a proven record with tens-of-thousands of successful installations around the world.

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