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Filter Inspection Techniques

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  1. Filter Inspection Techniques • Core Sampling • Visual Observation of Filter Surface • Probing Gravel Layer • Collect Media Sample – Sieve Analysis • View Media Under Microscope

  2. Inserting Core Sampling Tubes

  3. Examining Media Core Samples

  4. Visual Observation Mud/Mud balls

  5. Probing Media Depth to the Gravel Layer

  6. Collecting Media Sample for Testing – Sieve Analysis and Acid Solubility

  7. Before acid wash • Media is 16 years old • 16.5% weight loss • Low (12%) bed expansion • KMnO4 used in pretreatment • 8 hour filter runs • Mud balls deep in filter Afteracid wash 20X Magnification Digital Photos of Dried Media

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