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System types side by side, using what sellers list. Missing data is labeled, not guessed.
Listed figures come from sellers. Confirm current pricing at the seller. How we make money
ReferralEditor's referral. We may earn a commission; the seller fulfills the order. How we make money · Disclosure
ReferralEditor's referral. We may earn a commission; the seller fulfills the order. How we make money · Disclosure
ReferralEditor's referral. We may earn a commission; the seller fulfills the order. How we make money · Disclosure
ReferralEditor's referral. We may earn a commission; the seller fulfills the order. How we make money · Disclosure
ReferralEditor's referral. We may earn a commission; the seller fulfills the order. How we make money · Disclosure
| System | Format | Listed output | Filter interval | Install | Seller-listed cert | Price band | Seller |
|---|---|---|---|---|---|---|---|
| PitcherExample: Clearly Filtered Pitcher | Pitcher & gravity | Not listed by seller | Manufacturer-listed approximately 100 gallons | None | None listed by seller | Under $500 | Check today's price (referral link, opens in a new tab) |
| Under-sink ROExample: Waterdrop G3P800 Tankless RO | Under-sink RO | 800 GPD; fills a 6 oz cup in 5 s (manufacturer-listed) | G3-N1CF up to 6 mo / 550 gal, $29.99; G3-N3CB up to 12 mo / 1,100 gal, $29.99; G3P800-N2RO up to 24 mo / 2,200 gal, $139.99 (list prices, Oct 2026) | Not listed by seller | Waterdrop states: system certified by IAPMO R&T to NSF/ANSI 42, 53 and 58 for claims on its Performance Data Sheet, and to NSF/ANSI 372 for low lead (as listed by the seller) | $500 – $1,500 | Check today's price (referral link, opens in a new tab) |
| Countertop ROExample: Waterdrop N1 Countertop RO | Countertop | On-demand RO | Not listed by seller | None — pour-in reservoir | None listed by seller | Under $500 | Check today's price (referral link, opens in a new tab) |
| Whole-house carbonExample: Aquasana Rhino EQ-1000 | Whole-house | Manufacturer-listed 1,000,000 gallons / 10 years | Manufacturer-listed approximately 10 years (pro model) | Not listed by seller | None listed by seller | $500 – $1,500 | Check today's price (referral link, opens in a new tab) |
| Softener / conditionerNo reviewed example yet; read the guide | Not reviewed | Not reviewed | Not reviewed | Not reviewed | Not reviewed | Not reviewed | — |
| AtmosphericExample: Spout Monolith Countertop Water Generator | Atmospheric (AWG) | 0.75–2.5 gal/day (humidity-dependent) | Not listed by seller | Not listed by seller | None listed by seller | $1,500 – $5,000 | See it at WaterVO (referral link, opens in a new tab) |
ReferralSeller links are referrals; untracked brands show the review instead. How we make money · Disclosure
WaterVO Countertop Vapor OptimizerUp to about 2.5 gallons a day (manufacturer-reported); lower in drier or cooler air$1,499 (launch price)Read full review
WaterVO Floor Model Vapor OptimizerRoughly 1.5–2.5 gallons a day in coastal Southern California (about 2.5–3.0 on humid summer days); 5.3 gallons a day manufacturer high-humidity rating at 86°F/80% RH$1,999 (launch price)Read full review
Spout AWGUp to 2.5 gal/day$1,495Read full review
Kara Pure AWG2.5 Gal/Day$3,800Read full reviewIndependent seller. Hydrology University is the publisher and referral source, not the seller.