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.
Best iron filter for well water: air injection vs manganese greensand vs Birm, 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.
Best whole-house sediment filter for well water: spin-down vs cartridge, by published spec
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.