US Water Systems Flexx Oxi-Gen Aeration Iron and Sulfur Filter

Sale $2,230.14 against a compare-at $4,491.67 (20 GPM: $2,792.06 vs $5,325). Spec conflict: product page claims iron up to 8 ppm, H2S up to 6 ppm, manganese up to 0.5 ppm, pH 6-9; the manual's spec table says iron up to 10 ppm, H2S up to 12 ppm, manganese up to 0.7 ppm, pH 6.5-7.8. Not for iron or sulfur reducing bacteria. The manual only mentions catalytic carbon media, while the product page and on-page Q&A say Katalox Light is loaded below the catalytic carbon. Air can be drawn without a full backwash (water saving); Bluetooth Legacy View app; 9 V battery backup; 5 GPM backwash (FX-150); 20-100 psi, 39-100 F; needs a 120 V outlet (12 V transformer) and a drain. Cert finding: 'NSF Approved Components' and 'media tested and certified by the WQA to NSF/ANSI 61' are unverified for this system: WQA's product search has no US Water Systems listing, and NSF DWTU lists US Water Systems only for filter cartridges under NSF/ANSI 42 material requirements. weightLbs is the store's shipping weight for the 10 GPM variant (20 GPM: 146 lb). One reviewer posted twice about an injection valve leaking into an ozone generator after about 1.5-2 years (generator not covered). Optional add-ons offered on the page: Magna pre-filter +$196.30, UV +$1,195, Flexx HD softener +$951.95. Affiliate (UpPromote): 10%, 15% after $20k, 45-day cookie, 5% customer discount, 45-day payout hold, influencer and content creator program; coupon sites and paid search excluded. Chosen over Crystal Quest because CQ's only iron/manganese/H2S whole-house system is already in the database.