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I saw a filter cartridge with yellowish material at one of the trade shows. What is this media and why are Unicel cartridges white in appearance?

April 26, 2017cartridge cartridges filter material media saw shows Trade Unicel yellowish

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I saw a filter cartridge with yellowish material at one of the trade shows. What is this media and why are Unicel cartridges white in appearance?

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Unicel and virtually every brand name company in the filter business uses a spunbonded, 100% polyester material called Reemay as their filter medium. Reemay, which has FDA compliance, is approved for milk filtration and is white to indicate purity. The yellowish material (technically also a spunbonded polyester nonwoven) is less expensive.