OwnerSpec

Search every guide, calculator, part and review

Try a model number (GE MWF, Fleck 5600SXT) or a symptom (rotten egg smell).

Reviews

System comparisons segmented by the problem being solved, chosen against a stated method from published specifications.

The few pages on OwnerSpec that need judgement. Each one states how the shortlist was built, which published specifications were compared, and who should skip the pick entirely. We do not bench-test equipment and never claim to.

Well water 8 pages

  • Compare

    Best well pump: jet vs submersible by spec sheet

    Depth to water picks the type: under 25 ft a shallow jet (Red Lion RJS-75, 7.2 GPM at 25 ft, 40 psi), 25 to 90 ft a convertible, deeper a 4 in submersible (RL12G10).

    Updated · 12 min read

  • Compare

    Best well pressure tank, sized by drawdown and GPM

    Maker sheets compared: Amtrol WX-203 prints 8.6 gal drawdown at 40/60, WX-202 5.4, WX-250 11.8; sized on pump GPM and a 1 minute run. Pre-charge 2 psi below cut-in.

    Updated · 13 min read

  • Compare

    Best acid neutralizer filter for low pH well water

    Calcite treats pH 5.0 to 7.0, a calcite/Corosex blend reaches 4.5, per Clack. Backwashing Fleck 5600SXT vs upflow tanks by tank size, GPM and media.

    Updated · 10 min read

  • Compare

    Best whole house water filter for well water, by spec

    Pick: iSpring WGB32BM, rated to 3.0 mg/L iron and 1.0 mg/L manganese, 15 GPM, 100,000 gallons. Above 10 mg/L combined, a cartridge is the wrong tool.

    Updated · 10 min read

  • Compare

    Best water test kit for well and city water

    A mail-in certified lab kit (Tap Score Essential, 54 analytes, 5 business days) beats strips: no strip reads a coliform count, lead at 15 ppb or PFAS.

    Updated · 11 min read

  • Compare

    Best UV water purifier for well water, by spec

    Viqua VH410: 18 GPM at 30 mJ/cm2, 14 GPM at 40 mJ/cm2, 9,000-hour lamp. No unit here is NSF/ANSI 55 Class A; the VH410-V is Class B at 14 GPM.

    Updated · 10 min read

  • Compare

    Best spin down sediment filter for well water

    iSpring WSP-50: 50 micron stainless mesh, 20 GPM, 25 to 80 psi. Auto-flush: WSP50ARB, 25 GPM. High flow: Rusco 1-1/2 in, 18 to 100 GPM, 150 psi.

    Updated · 11 min read

  • Compare

    Best iron filter for well water, by published spec

    Iron plus manganese 3 to 10 mg/L: an AIO such as the AFW AIS10-25SXT (10 ppm iron) or Birm at pH 6.8 to 9.0. Under 3.0 ppm with no drain line: the iSpring WGB32BM.

    Updated · 11 min read

Water softeners 6 pages

  • Compare

    Best whole house filter and softener combo, by spec

    AFW Fleck 5600SXT 48K with upflow carbon: 48,000 grains, 12 gpm, 1.5 cu ft carbon. Aquasana SimplySoft 60K prints NSF/ANSI 44; Kind and SpringWell are salt-free.

    Updated · 12 min read

  • Compare

    Best water softener cleaner: Res Care vs Iron OUT

    ResCare vs Iron OUT vs Rust OUT: what each SDS lists, the label dose per cubic foot or per 40 lb of salt, who claims NSF/ANSI 60, and who should skip each one.

    Updated · 11 min read

  • Compare

    Best water softener for city water, by spec

    AFWFilters Fleck 5600SXT 48K: 1.5 cu ft of 10% crosslink resin, 6.5 gpm, 5-year valve and 10-year tank warranty. Six in-stock Amazon units compared on maker figures.

    Updated · 12 min read

  • Compare

    Best portable RV water softener, by grain capacity

    On The Go OTG4-VM-DBLSOFT and Glacier Fresh at 16,000 grains cover most hookups; divide grains by hardness in gpg for gallons between regenerations.

    Updated · 9 min read

  • Compare

    Best water softener salt: pellets vs crystals vs KCl

    Pellets with an anti-bridging additive at 99.65% to 99.8% published purity are the default; potassium chloride needs 10 to 15% more product per regeneration.

    Updated · 10 min read

  • Compare

    Best water softener for well water, by spec

    AFWFilters Iron Pro 2 64K: the only Amazon-sold softener with a printed iron ceiling, 6 ppm, 2 cu ft fine mesh resin, 10 gpm. Above 5 ppm an iron filter goes first.

    Updated · 12 min read

City water 5 pages

  • Compare

    Best whole house water filter for PFAS, by spec

    A.O. Smith HomeShield AOS-HS-1200 is the only whole-house unit found with NSF/ANSI 53 PFAS certification: below 4 ng/L for 500,000 gal at 5.7 gpm.

    Updated · 10 min read

  • Compare

    Best faucet mount water filter: lead, PFAS, by spec

    PUR PLUS RF9999: NSF/ANSI 42, 53 and 401 listed, 99.92% Total PFAS, 100 gallons, 0.52 gpm. ZeroWater ExtremeLife: 400 gallons, PFOA/PFOS only, no lead line.

    Updated · 9 min read

  • Compare

    Best whole-house water filter for city water

    Chlorinated city water: Pentair Pelican PC600 (NSF/ANSI 42 and 61, 662,400 gal, 8 gpm) or Aquasana EQ-1000 (1,000,000 gal). Over 8 GPM: iSpring WGB32B, 15 GPM.

    Updated · 11 min read

  • Compare

    Best under sink water filter without RO, by spec

    CuZn UC-200: 50,000 gallons or 5 years, NSF/ANSI 42 and 372 listed. Aquasana Claryum Max Flow: NSF/ANSI 42, 53 and 401, 99.7% PFOA/PFOS, 800 gallons.

    Updated · 10 min read

  • Compare

    Best shower filter: who can prove NSF/ANSI 177?

    NSF/ANSI 177 covers free chlorine only. No brand here is in NSF's listing. Sprite's own sheet names the standard; Culligan names only a certifier.

    Updated · 9 min read

Drinking water 3 pages

Filters and cartridges 3 pages

  • Compare

    Best gravity water filter: Berkey alternatives

    LifeStraw Home states NSF/ANSI 42, 53, 401 and a 264 gal membrane; Waterdrop King Tank states 42, 372 and 6,000 gal carbon. No listing confirmed.

    Updated · 10 min read

  • Compare

    Best RV water filter: inline vs canister, by spec

    No RV inline filter page read lists NSF/ANSI 53. The one maker with published figures rates 5 micron nominal, 1 to 4 months, on a 3/4 in hose thread.

    Updated · 10 min read

  • Compare

    Best whole-house sediment filter for well water

    Coarse sand: a Rusco spin-down, 1 to 25 GPM, screens 700 to 15 micron. Fine silt: a Pentek 150233 Big Blue at 1 psi @ 15 gpm with a 5 micron nominal cartridge.

    Updated · 10 min read

Reverse osmosis 3 pages

  • Compare

    Best under-sink reverse osmosis system, by spec

    Tankless: Waterdrop G3P800, 800 GPD, 3:1 pure to drain, NSF/ANSI 58 and 372. Tanked: iSpring RCC7AK, 75 GPD, NSF/ANSI 58, alkaline stage. Yearly filter cost.

    Updated · 10 min read

  • Compare

    Best tankless reverse osmosis system, by spec

    Waterdrop X12 leads at 1,200 GPD and 3:1 pure to drain, NSF/ANSI 58 and 372 listed. Waterdrop G3P600 is the right-sized pick at 600 GPD and 2:1.

    Updated · 10 min read

  • Compare

    Best countertop reverse osmosis system, by spec

    Waterdrop M6SL is the pick: NSF/ANSI 58 and 372 on its page, 75 GPD, 3:1 pure to drain, $69.99 filter per 1,100 gallons. Six units on published spec.

    Updated · 11 min read

Refrigerator filters 1 pages

  • Compare

    Best refrigerator water filter, by listing row

    Genuine cartridges by maker document and certifier row: Frigidaire EPTWFU01 IAPMO R&T 42, 53, 401 at 125 gal; everydrop EDR1RXD1 NSF 200 gal; GE XWFE 170 gal.

    Updated · 12 min read

Whole-house systems 1 pages

  • Compare

    Best 20 inch Big Blue filter housing, by spec

    Pentek 150233: 1 in NPT, 90 psi max, NSF/ANSI 42 listed housing. iSpring WGB32B if you want a full 15 GPM system with wrench and bracket in the box.

    Updated · 10 min read