The G3P800’s PFOA/PFOS claim is certified — but under a separate IAPMO file (WC-14805, NSF/ANSI 53) from its RO claims (WC-13976, NSF/ANSI 58). We read the listings claim by claim and totalled five years: $669.85 in filters, around $1,429 at the $759 promo price or around $1,669 at $999 list.
Remineralization stages add small amounts of calcium and magnesium and mainly change taste and pH slightly — diet dwarfs water minerals, so this is a taste choice, not a health necessity. Five options compared with verified prices, replacement intervals, per-year cost math shown, and what TDS after a remin stage (roughly 20–90 ppm) actually means.
Bottled feels cheap a case at a time; RO feels expensive on one day. Priced per gallon over five years for three households — with every line of math shown, break-even months, and the bottled route that stays competitive.
Pre-filters at 6–12 months, membranes at 2–3 years — but the real schedule, cost and membrane test differ by model. Manufacturer intervals for five systems, floor-counted annual costs from about $44 to $134, and the $15 TDS check that beats any indicator light.
A tank RO system sends about 9 gallons a day to the drain for a family — roughly $33 a year at typical rates. We read the ratios correctly, work the math, and show when tankless efficiency actually pays.
No plumbing, no landlord permission, moves with you. Of six countertop RO systems, only one is fully certified for its contaminant claims — we verified the paperwork and the 5-year costs for all of them.
AquaTru Classic vs Waterdrop K19-H vs Frizzlife WB99-C: verified IAPMO certifications, footprint, remineralization — and a full 5-year cost table with the arithmetic shown.
Five under-sink RO systems checked against the actual NSF, WQA and IAPMO listings — three are certified for TDS only — with full 5-year filter costs and an honest top pick.
