Excerpt from article on CCJ Online:

To some owner/operators, a filter is a filter, and the less you pay for it the better. A low-cost “garden variety” filter may be a good fit for a peaking unit that runs a few hundred hours a year, or less, in a location with “normal” ambient conditions. But that same filter might not be a wise choice at a seacoast location or in an area that gets an extreme amount of rainfall. Do your homework. Caveat emptor is something to keep in mind at all times.

High-efficiency particulate air (HEPA) filters are at the opposite end of the spectrum from the most basic of air inlet filters. They are designed to capture the very small particulates entrained in gas-turbine inlet air that are most responsible for compressor fouling. But at a price: The cost of an E12 HEPA filter may be as much as four or five times the asking price for a “conventional” F8 filter. When hydrophobicity is combined with HEPA performance, the filter can prevent ingestion of both submicron particles and water-soluble contaminants—such as salt—which can damage the engine over time.

In the last two years (April 2012 to April 2014), Alliance has avoided nearly 150 water washes. More importantly, it has eliminated nearly 150 shutdowns that might have caused other issues to arise...

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