Clean water starts with knowing what's in it.
Whether you're on a private well or city water, we match the fix to your actual problem — iron, sulfur, hardness, arsenic — and rank systems by what they remove and what they cost to own.
- Independent Systems ranked by what fixes your water and what it costs to own.
- Standards-checked Every recommendation weighed against NSF/ANSI certifications and EPA limits.
- Honest about limits We cite specs, lab standards, and real owner reports — and say what we haven't tested.
Start with your water
Three common situations. Pick the one that sounds like you, and we'll take you to the right place — diagnosis first, then the fix.
Diagnose my well water
A 90-second quiz points you to the likely cause — iron, sulfur, hardness, arsenic — and how to confirm it. No email required.
Take the quiz →Diagnose my city water
Chlorine taste, scale, discoloration, or a lead worry? A 90-second quiz reads the signs at your tap and points you to your utility’s free report and the test it can’t replace.
Take the quiz →Better drinking water
Taste, odor, and dissolved contaminants at the kitchen tap — reverse osmosis and under-sink filters.
See the options →Browse by category
Independent buyer's guides, grouped by the system or the problem they cover.
Well water
Iron, sulfur, hardness, arsenic and more — diagnose it, then match the fix.
Browse →Softeners & hard water
Salt-based and salt-free systems for scale, spots, and dry skin.
Browse →Reverse osmosis
Point-of-use RO for nitrate, arsenic, and high TDS.
Browse →Contaminants
Match a symptom to the contaminant behind it, then the treatment that removes it.
Browse →Under-sink filters
RO and carbon filters for cleaner, better-tasting water at one tap.
Browse →Latest guides
Every guide traces its recommendation back to a specific contaminant and a real ownership cost — never a brand deal.
Hard Water vs Soft Water: The Real Difference and How to Tell Which You Have
Hard water carries calcium and magnesium that leave scale and soap scum. Soft water swaps them for a little sodium. The full side-by-side, and how to tell.
Read the guide →
Water Softener Installation: The DIY-vs-Pro How-To Guide
How to install a water softener step by step: bypass valve, drain line air gap, brine line, and slow start-up, plus DIY-vs-pro cost and permit rules.
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Water Softener Maintenance: The Simple Upkeep Schedule
What water softener maintenance takes: refill salt, fix salt bridges, clean the brine tank yearly, and replace resin at 10-15 years. The full schedule.
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Arsenic in Well Water: What It Means and How to Remove It
Arsenic in well water has no taste, smell, or color, so a lab test is the only way to know. Here's what it means for your health and how to remove it.
Read the guide →