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Some variability in filter times is normal. Default filter time settings encompass much of this variability. Default settings for IDF/SDF filtration are as follows: IDF after the release of bar B (five minutes), IDF after water rinses (one minute)...
AOAC 991.43 calls for filtration via a fritted crucible of 40-60 microns with Diatomaceous earth, or equivalent. Particle retention per the method is accomplished by adding diatomaceous earth contained in a fritted crucible. The fine filtration and...
Some sample types can be difficult to filter, even though the IDF and SDF filter bags have a significantly greater filter surface area than the Gooch crucible. Some samples become gelatinous in an aqueous solution (such as psyllium, chia seeds, or...