Ever notice how water goes slower through a new filter? That’s a good sign. The charcoal is doing its job. As the water flows through, it has to make contact with the charcoal’s surface area. Too fast, and the contaminants slip through. Too slow, and you’re waiting forever for a glass.
Standard filter pitchers optimize for this. They force water through a dense carbon block or loose granules. Carbon block filters are generally more effective because they’re compacted, offering more contact time and better particle removal.
Practical tip: If your filter pitcher is new, let the first batch of water run through and discard it. That flushes out any loose carbon dust. Your taste buds will thank you.
Function Of Charcoal In Home Made Filter at Charlie Ortega blog