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ClearFlow Grade · Water Treatment Lab

ClearFlow Grade

Expert reviews, honest comparisons, and the best deals on Water Filters — helping you make smarter buying decisions.

Browse the buying guidesSize my system
Systems on the bench
10
Buying guides
12
Treatment paths
6
The System Matcher

What system does your water call for?

Enter your measured water hardness and household size. We run the published Water Quality Association sizing formula to point you to a system class and an illustrative annual filter cost — a starting estimate, not a tested result.

From your utility's water report or a test kit. 1 GPG = 17.1 mg/L (ppm).

Sizing assumes the WQA estimate of 75 gallons per person per day.

Where the formula points

32,000-grain water softener

Extremely hard water · target 32,000-grain

Illustrative annual salt cost: about $80–$150 (varies with hardness and use)

Published WQA sizing: 4 people × 75 gal/day × 15 GPG = 4,500 grains/day, ×7 days ≈ 31,500 grains of weekly capacity. The smallest standard class that clears that is shown — size up if you host guests or have well-water iron.

Read the matching buying guides

Illustrative only — figures come from published WQA sizing formulas and market price ranges, not a physical test. Well-water iron, flow rate, and salt efficiency change the right pick; verify specifications on the retailer's listing before buying.

On the bench

Systems on the bench

Every filtration system and softener we cover, read off its published spec sheet — grain capacity, stages, and rating, not a paid placement.

Spec sheetTop pick

Prime for Young Adults — Free Trial

Prime for Young Adults — Free Trial — $30 bounty (tag ebikerevolt0e-20).

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Spec sheet
Instant 4-in-1 TDS Meter Digital Water Tester for Drinking Water

Instant 4-in-1 TDS Meter Digital Water Tester for Drinking Water

VARIFY — Instant 4-in-1 TDS Meter Digital Water Tester for Drinking Water

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Spec sheet
PUREPLUS 5 Micron 10" x 4.5" Whole House Sediment and Carbon Water

PUREPLUS 5 Micron 10" x 4.5" Whole House Sediment and Carbon Water

PUREPLUS 5 Micron 10" x 4.5" Whole House Sediment and Carbon Water

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Spec sheet
MyHalos® Filtered Shower Head for Hard Water Filter

MyHalos® Filtered Shower Head for Hard Water Filter

MyHalos® Filtered Shower Head for Hard Water Filter

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Spec sheet

Amazon Music Unlimited — Free Trial

Amazon Music Unlimited — Free Trial — $3 bounty (tag ebikerevolt0e-20).

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Treatment paths

Explore by Topic

Pick the problem you're solving — hardness, well-water iron, drinking-water taste — and we'll point you to the published comparisons that fit.

Whole-House Filtration SystemsPoint-of-entry carbon and tank-based systems that filter every tap in the home.3 guidesWater Softeners & ConditionersSalt-based softeners and salt-free conditioners for hard-water homes.2 guidesReverse Osmosis SystemsUnder-sink and tankless RO systems for high-purity drinking water.3 guidesUnder-Sink & Countertop FiltersCompact point-of-use filtration for kitchens and rentals.1 guideWell & Problem-Water TreatmentSediment, iron, sulfur and pH treatment for private-well and problem water.2 guidesFilters, Cartridges & MaintenanceReplacement cartridges, salt, and the annual upkeep cost of owning a system.1 guide
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Whole-House Filtration Systems5 min read

How much does a whole-house water filtration system cost in 2026?

Whole-house water filtration sticker prices range from $100 to over $3,000, but the number that matters most is total cost of ownership — equipment plus annual cartridge and maintenance costs over time. Based on published pricing and install estimates, here is what to budget by system type and house

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