AquasanaSmartFlow Reverse Osmosis Under Sink Water Filter, 90 Contaminants

No thread names this model, and five threads discuss Aquasana reverse osmosis generally on r/WaterTreatment, r/water and r/BuyItForLife. The tone is measured rather than enthusiastic: one owner reports better taste and no odour and says he liked having a remineralisation stage, and the same thread carries the line's most specific negative, an owner two years in describing water coming out of the unit while the tank refills and calling it a huge leaking problem that started after a year. Slow flow to a fridge line and the cost of proprietary cartridges each recur. Leaks are the brand's signature failure mode and appear in nine independent threads across the catalogue.

An independent laboratory test of this system returned the best filtration result that tester has recorded: 100 percent reduction of chlorine, fluoride, magnesium, nitrate, nitrite, potassium, selenium and strontium, total dissolved solids down 95.4 percent from 654 to 30 ppm, hardness down 98 percent, and sodium down 91 percent. The two exceptions are named - total chromium at 93 percent and vanadium at 56 percent - and TDS creep of 37 ppm was measured after ten hours idle. It scored 8.39 overall with a maximum ten for performance certifications, against an annual filter cost of $464.93, which that tester records as the highest ongoing cost of any conventional reverse osmosis system it has scored.

Across four filmed comparisons running to 172,802, 103,689, 81,274 and 74,897 views, this system takes the highest filtration score of every under-sink and reverse osmosis unit that tester has run, most recently out of 25. The measured detail: 100 percent reduction of chlorine, all four disinfection byproducts, copper, barium, boron, zinc, strontium and uranium, with fluoride at 82 percent and nitrate at a minimum of 76 percent, 1.8 gallons of usable water per tank filled in 43 minutes at 75 psi. The reservations are specific and go against the tester's own interest: the remineralisation filter did not appear to work at all in the lab results, the tank valve is judged below the competition, there is no filter life indicator, and a small leak at the faucet base could not be fixed.

The current chrome listing reads 4.2 out of 5 from 57 ratings, a small pool just above the floor. Aquasana runs several SmartFlow listings rather than one and the older generations read materially lower - 3.4 from 74 on a chrome listing with no featured offer, 3.5 from 151 on brushed nickel, and 4.0 from 66 on a further entry. Every count differs, so these are separate files rather than one pooled family, and the spread across them is wider than the headline figure suggests. Scored on this row's own listing and discounted for the small pool and that spread.

Home Depot does not list this system. Walmart lists the previous generation of it, which reads 4.0 out of 5 from 99 ratings and is currently unavailable; the star distribution on that page sums to its own count, which is what establishes it as a genuine product average rather than a seller rating occupying the same slot. It is the previous model code, so it is line evidence for this row rather than product evidence. Beneath it the brand's own third-party profiles set a floor - Trustpilot at 1.5 from 172 with 77 percent one-star, the Better Business Bureau at 1.42 from 33 - and reverse osmosis owners appear specifically in that pool, including one reporting repeated leaks across a decade of ownership.