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  1. thwilli2

    Filter Pressure Rating

    I am selecting a filter for an water application. Some of the Filter information follows: Change out DP = 25 psi Max Operating P at Ambient Temp: 60 PSI If the filter DP never exceeds 25 psi why is the max operating pressure limit to 60 psi? Shouldn't the impact on the filter be the same...
  2. thwilli2

    Filtration

    I there a difference between absolute filter efficiency rating and beta ratio? Is there a ASTM standard related to this subject? Thanks Tom

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