Filter Inspection TechniquesFilter Inspection TechniquesCore SamplingVisual Observation of Filter SurfaceProbing Gravel LayerCollect Media Sample – Sieve AnalysisView Media Under Microscope

Inserting Core Sampling TubesInserting Core Sampling Tubes

Examining Media Core Samples

Visual Observation Mud/Mud balls

Probing Media Depth to the Gravel Layer

Collecting Media Sample for Testing – Collecting Media Sample for Testing – Sieve Analysis and Acid SolubilitySieve Analysis and Acid Solubility

•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

•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

After acid washAfter acid wash

Before acid washBefore acid wash

20X Magnification Digital Photos of

Dried Media