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What Filter Removes

Aquasana SmartFlow RO vs Brondell Circle RC100

Only the Aquasana SmartFlow RO is certified to reduce PFAS, chloramine, nitrate and mercury and 1 more. Verdict: the Aquasana SmartFlow RO for broader certified protection (14 vs 9 of the contaminants we track); the Brondell Circle RC100 if running cost matters more. Replacement filters and water for 2 people cost about $321 a year on the Aquasana SmartFlow RO and $214 on the Brondell Circle RC100; they cost $480 and $450 to buy.

Aquasana SmartFlow ROBrondell Circle RC100
TypeUnder-sink reverse osmosisUnder-sink reverse osmosis
Price$480$450
Filters + water a year (2 people)$321$214
Filter cost per gallon (rated life)——
Gallons per day25.740
Pure to drain0.38:10.5:1
Installationdiydiy
PFASCertified—
LeadCertifiedCertified
ChlorineCertifiedCertified
ChloramineCertified—
FluorideCertifiedCertified
ArsenicCertifiedCertified
NitrateCertified—
Chromium 6CertifiedCertified
MercuryCertified—
MicroplasticsCertified—
CystsCertifiedCertified
VOCsCertifiedCertified
TDSCertifiedCertified
CopperCertifiedCertified
Check price on Amazon: SmartFlow RO →Check price at Brondell: Circle RC100 →