Is there anything I can do to speed up filtration for very contaminated samples? I use the 90mm disks, and it can take more than my shift length to filter.

This is an unfortunate problem with the solid phase extraction process. There are some samples that, due to the nature of suspended solids present, are difficult to extract through the disc. It is possible to collect a smaller portion of sample as long as you adjust the reporting limit appropriately. You may also use multiple discs to extract one sample. If you choose to use this option, make sure to elute all discs for one sample into the same container so that the combined residue can be weighed.

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