Water & Wellness · Water education

How Water Filters Work

By Water & Wellness · Updated October 17, 2026

Different filters do different jobs. The useful question is what a complete system is documented to reduce in your water.

Sediment filtration

Physical filtration holds back particles. A micron rating describes a size scale, but a small number alone does not establish removal of dissolved chemicals or germs.

Activated carbon

Carbon uses adsorption: certain substances attach to its surfaces. The media, contact time, flow, and tested capacity affect performance. A chlorine claim does not automatically establish a chloramine claim.

Electropositive media

Purative’s MicronGuard stage combines physical interception with positively charged media surfaces that attract negatively charged material. This explains the approach; it does not substitute for a model-specific reduction test.

Reverse osmosis

Pressure moves water across a semipermeable membrane. RO systems also commonly use prefilters and carbon stages. Review the complete system’s performance information rather than the membrane alone.

What about a softener?

A conventional ion-exchange softener addresses hardness by exchanging calcium and magnesium ions. Scale management and softening are different functions. Purative is not a traditional softener and does not claim to remove hardness.

Follow the water through Purative

  1. Prepare: sediment and scale-management stage.
  2. Capture: MicronGuard advanced filtration.
  3. Finish: carbon-based filtration before water continues through the home.

View Purative’s documented performance scope for the distinction between underlying-system listings and the Purative configuration. Water advisories and unknown-quality supplies require guidance appropriate to the actual issue.

Sources and further reading