What types of certified filters are on the market?

There's a variety of filters out there. They include pour-through pitchers and carafes, faucet-mounted filters, countertop and under-sink filters, showerhead filters, and refrigerator filters.

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1. What should I know before buying a home water filter or treatment device?
2. What types of certified filters are on the market?
3. What is the difference between a point-of-use filter and a point-of-entry filter?
4. Where can I buy a filter?
5. Do showerhead filters remove chlorine?