Clean and Reuse Filter Elements?

"We have been advised not to reuse filter elements, but instead to replace them every 12 months if they have not blocked before then. Is this a ploy by the filter supplier to sell more filters?"

Most reuseable wire mesh strainers are generally ineffective for fine filtration purposes and may become damaged when recleaned. Larger holes often appear in the mesh through mishandling or because the mesh is not properly cleaned.

Cleaning of common disposable elements is a false economy as the media weakens with age, thus allowing the reappearance of significant amounts of debris back into the system in the event of a minor pressure surge. In fact, because of vibration and fatigue, in-service elements become susceptible to failure with age, hence the 12-month recommended change. To be sure of the protection provided by your filters, ensure a regular program of particle counting.

In sum, the cleaning of filter elements is generally not worth the risk for the minor savings of their reuse. A possible exception includes filter elements specifically designed for reuse by a well-tested cleaning procedure.

From the Handbook of Hydraulic Fluid Technology

Fluid can bypass a filter element for many reasons. Improperly sealed side seams and end caps on the filter element itself is one possibility. In addition, the element can rupture during operation or be damaged before installation, and the result will be high bypass flow. However, the two primary causes are a poor fit between the element and the housing, and a bypass valve which is poorly designed or stuck open due to silting.

More about the Handbook of Hydraulic Fluid Technology