Filter Inspection Techniques

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

• 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

Before acid wash
After acid wash
20X Magnification Digital Photos of Dried Media