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  • Writer's pictureGreen Synergy Engineering

Case Study: Diagnostic Manufacturer Switches to Pleated Filters for Pre RO

Application: Pre Reverse Osmosis (RO)

Previous Product Used: Evoqua PN W2T177996 20" Cartridge Filter

Graver Product: Graver PMC Series Cartridge Filter (PMC1-20P3E)



A diagnostics manufacturer was purchasing an Evoqua 1 micron pleated polypropylene cartridge filter for post treatment to an auto backwashing carbon filter, which also served as the a pre-filter to an RO system used to produce high purity water.

As part of their maintenance service contract, Evoqua re-bedded the carbon bed and they immediately started to see short service runs on the 7-round 20” 1-micron filters. The engineer on the project requested assistance from the distributor, who was active in other applications with Graver product, to resolve the issue. It was decided to evaluate the PMC 1-micron as the option. The initial test resulted in an increased onstream life of three times the Evoqua filter.

The Engineering department submitted the change which was approved, resulting in the elimination of system upsets and extended change-out frequency to every 7-10 days, further reducing the labor required to maintain the system.


  • The PMC filter resulted in higher throughput which resulted in less frequent change-out and reduced labor input.

  • Using PMC filter helped increased onstream life three times from the Evoqua filter.

  • Graver’s distributor was instrumental to this success by providing on-site technical support optimize the customer’s filtration process.

  • While melt blown is the more common technology in use as Pre RO, it is possible to justify the use of pleated cartridges within water systems when factor other than filter pricing is evaluated.

Download the PMC Series Cartridge Filter data sheet here.

Green Synergy Engineering is the sole distributor of Graver Technology Liquid Process Filters in Malaysia. Contact us to find out more about our products and services.

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