I am looking for a filter paper equivalent to Whatman 30 for use in SM4500 Boron, vaccum or syringe filtration. Please suggest product.

Whatman Grade 30 filter paper appears to no longer be available or even listed as a product for comparison purposes. Without that information we do not have a guaranteed cross reference product for it. In Standard Methods it appears to be solely used for removing turbidity to provide a better optical reading. We recommend one of the items listed here - http://www.envexp.com/products/18-Filtration/FILTFIL-All_Filters/2FP2-Acid_Washed_-_Ashless

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