The Filter Judge is inserted into the media while it is slightly fluidized during mild backwash. After full insertion into the media, a slotted inner tube is rotated inside of a slotted outer tube to capture a representative sample of the media. The inner tube is then rotated such that the slots are opposed to each other, thus capturing the sample. The tool is then removed from the filter. Water then drains from the annular space between the two tubes. The Filter Judge is then laid horizontally, and the tubes are rotated to expose the captured media sample. The sample can then be measured to determine the depth of each layer, the depth of any interface zone between layers, the extent of contamination (i.e.—mudball formation), or the sample can be removed from the tool for further testing (i.e.—sieve analysis, chemical composition, etc.).
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