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Plain-English answers
Five-minute explainers on the questions readers ask us most: chloramine, PFAS, softener cycles, the real cost of a well, and how often to swap filters.
Whole-house water treatment sounds simple from a sales page: one tank at the main line and better water everywhere. In practice the right choice depends on whether you are on city water or a private well, what specifically is in the water, how hard it is, and how much flow your household needs at peak demand. The articles below break each of those variables down so you can buy and install without guessing.
Every explainer on this page sticks to two ground rules. First, we describe U.S. water in the way regulators actually frame it: the EPA sets the legally enforceable Maximum Contaminant Levels (MCLs) that every utility must meet, and groups like the Environmental Working Group publish stricter, non-enforceable health guidelines that most homeowners use when they choose a filter. Second, we never claim your water is unsafe. If a contaminant is flagged on a city page, it is above the stricter guideline, not above a federal limit.
New articles are added as readers ask us questions and as NSF, IAPMO and EPA documents update. If you do not see your topic, the closest match in the list usually has a section that covers it, and most articles link out to the primary source so you can verify the numbers yourself.
All articles
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4 min read
Is Chloramine Safe to Drink?
Chloramine is the EPA-approved disinfectant used by hundreds of U.S. utilities. Here is what the science says and how to remove it if you want to.
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4 min read
How Often Should You Replace a Whole-House Water Filter?
Cartridge filters, tank-style media, and softener resin all have different schedules. Here is the realistic replacement timeline by system type.
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4 min read
Do I Need a Water Softener?
Hardness above 7 grains per gallon is where scale damage starts to show. Here is how to tell if your home actually needs one.
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5 min read
What Are PFAS in Drinking Water, and Should You Worry?
PFAS are a family of long-lasting industrial chemicals now regulated by the EPA. Here is the current limit, the EWG guideline, and how to remove them at home.
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5 min read
Well Water vs City Water: True Cost Over 10 Years
Well water has no monthly bill, but the equipment, electricity, and testing add up. Here is the realistic 10-year math.
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7 min read
How to Install a Whole-House Water Filter (Step-by-Step DIY Guide)
A step-by-step DIY guide to installing a standard tank-style whole-house water filter, including tools, plumbing cuts, bypass valves, and startup.