Research published
Aquasana
Direct-to-consumer brand
Direct-to-consumer line spanning conventional softening, salt-free conditioning, whole-home filtration and under-sink reverse osmosis.
6Named configurations
Last verified
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We publish independent research on water-treatment brands and their product lines. Each profile includes verified certifications, warranties, technology, and what we still need to confirm.
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Research published
Aquasure
Brand
Aquasure sells softeners, salt-free conditioners, whole-home and under-sink filtration, reverse osmosis and a countertop filter direct to consumers and through retailers.
11Named configurations
Last verified
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Research published
Culligan
Manufacturer / dealer brand
Conventional softeners, whole-home carbon filters and under-sink RO sold and serviced through local dealers.
3Named configurations
Last verified
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Research published
EcoWater
Manufacturer / dealer brand
Conventional ion-exchange softeners, a combined refiner with activated carbon, and salt-free anti-scale systems sold through authorized dealers.
3Named configurations
Last verified
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Research published
Gemline / Nugen
Brand / model alias
Water softeners and KDF filtration.
9Named configurations
Last verified
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Research published
HALO
Manufacturer brand
Whole-home filtration and conditioning.
13Named configurations
Last verified
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Research published
Kinetico
Manufacturer / dealer brand
Non-electric twin-tank softeners, whole-home chloramine filters and under-sink RO sold and serviced through authorized dealers.
4Named configurations
Last verified
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Research published
North Star
Manufacturer brand
Water softeners and filtration systems.
20Named configurations
Last verified
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Research published
Pentair / Pelican
Manufacturer
Pentair acquired Pelican Water Systems in 2019; the reviewed evidence covers the discontinued WF6-P/WF10-P combo, NaturSoft salt-free conditioning media and the Clack V3007 component certification.
4Named configurations
Last verified
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Research published
RainSoft
Manufacturer-controlled brand
Conventional softeners, whole-home carbon filters and element/module-bounded under-sink RO sold and serviced through authorized dealers.
5Named configurations
Last verified
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Research published
Rheem
Licensed brand
Rheem water softeners are manufactured under license by Water Channel Partners; the Preferred Series RHS18/RHS32/RHS42/RHW42 carry exact-model NSF/ANSI 44 rows and are sold at Home Depot.
5Named configurations
Last verified
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Research published
SpringWell
Brand
SpringWell sells whole-home filtration, salt-free conditioning, conventional softening, well-water oxidation, PFAS adsorption and a Moen-branded RO directly to consumers.
6Named configurations
Last verified
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Research published
Watts
Manufacturer
Multi-category treatment systems and components.
27Named configurations
Last verified
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Research published
Whirlpool
Licensed brand
Whirlpool water treatment is a licensed brand: Water Channel Partners (softeners, RO, filtration) and Kemflo (filtration) manufacture under the Whirlpool trademark, with legacy Ecodyne-era products.
9Named configurations
Last verified
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Research published
A. O. Smith
Manufacturer
A. O. Smith Corporation manufactures its water-treatment line: seven exact-model NSF/ANSI 44 softener rows under the Milwaukee listee, an NSF/ANSI 58 AORO-50 RO under a separate Appleton listee, and a documented 3/10 legal warranty (with a conflicting promotional 5/10 claim).
8Named configurations
Last verified
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Research published
iSpring
Manufacturer
iSpring Water Systems, LLC manufactures a direct-to-consumer line strongest in reverse osmosis: exact-model NSF/ANSI 58 rows for the RCC7 family and RO500 line, with softeners, salt-free conditioners, whole-house filters and UV systems kept in separate mechanisms.
8Named configurations
Last verified
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Publisher boundary: Water System Guide is an independent research publisher, not a manufacturer, dealer, installer, utility, or laboratory.