Point-of-entry (POE) treatment happens at your home's main water line, before water branches out to faucets, showers, and appliances, so every tap in the house gets treated water. That's the difference from point-of-use systems, which treat water at a single faucet, like an undersink filter.
This collection brings together whole-house products from Viqua, Tier1, and Pioneer. Most have their own dedicated collection, so jump straight to the one that matches your concern:
Many homes combine several of these, typically sediment filtration first, followed by softening or carbon, with UV last so it treats the cleanest water.
Not sure where to start? Call 1-800-277-3458.