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📘 A filter catches what its pathways cannot pass

A water filter is a selective barrier, not a magic eraser.

4
lessons
~20 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. Particle sizeExplain how contaminant size and pore structure affect particle capture.Filters retain suspended particles through straining and pathways with varied sizes.
  2. Particle size and depthContrast depth capture in thick media with membrane surface capture.Tortuous beds and thin membranes each create a different particle barrier.
  3. Flow, adsorption, and plant prepRelate clogging, activated-carbon adsorption, and coagulation before filtration.Resistance rises as media load, carbon adsorbs selected molecules, and plants enlarge colloids first.
  4. What passes, maintenance, and trainMatch barriers to contaminants, service filters reliably, and see multi-stage treatment trains.Clear water is not proof of complete treatment; verified chains of barriers need maintenance.

Questions this course answers

What does a sediment filter primarily retain?

Sediment filtration is designed around particulate matter and pore pathways.

Why does a loaded filter need more pressure for the same flow?

Narrower and more tortuous pathways increase hydraulic resistance.

What is adsorption in activated carbon?

Adsorption is surface attachment, distinct from straining suspended particles.

Why can a clear sample still contain a contaminant?

Appearance does not reveal all dissolved chemicals or microorganisms.

What should guide a filter choice first?

Different contaminants require different mechanisms and verified claims.

Why may a treatment plant coagulate before filtration?

Larger flocs settle and filter more readily than persistent tiny colloids.

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