Consider these factors:

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  Source water quality – Get a water quality report or test your water. Well water may need UV or heavy metal removal; municipal water often needs chlorine and lead reduction.

  
  


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  Contaminants of concern – For lead, nitrates, or PFAS, reverse osmosis is highly effective. For bacteria, UV or ultrafiltration is required.

  
  


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  Budget – Pitcher filters cost less upfront but have higher long-term cartridge costs. Under-sink RO systems have higher initial cost but lower per-gallon treatment cost.

  
  


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  Installation and maintenance – Whole-house systems require professional installation; POU systems are often DIY-friendly.

  
  


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  Flow rate and capacity – Check the system's gallons per minute (GPM) and filter lifespan (typically 3–12 months).

  
  

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