EcoWater Systems ECR3700R20
A NSF-certified whole-house filter that is certified to reduce 2 contaminants.
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You want every tap and shower treated — best for chlorine, sediment, and taste across the whole home.
Certified to reduce 2 contaminants.
This is an aesthetic-standard filter (NSF 42) — it improves taste and reduces chlorine, but is not certified for health contaminants like lead or PFAS.
What is whole-house system? A point-of-entry system installed on your main water line, treating every tap and shower in the house. Compare all filter types →
What it costs to own
| Upfront price | Check on Amazon → |
| Replacement filter | — |
| Estimated yearly cost (filters, ~1×/yr) | — |
| True cost per gallon | — |
Cost per gallon and yearly cost are our estimates from the rated capacity and current prices. The filter only works if you replace it on schedule.
What it's certified to remove
Certification is per-contaminant: the EcoWater Systems ECR3700R20 is credited only for the contaminants listed here, verified by NSF. It does not imply removal of anything not listed.
✓ Verify this certification on the official NSF listing →
Full specifications
| Certified by | NSF |
| NSF/ANSI standards | 44 — water softener — reduces hardness (calcium/magnesium) |
| Filter type | Whole-house system |
| Flow rate | 9 gpm |
| Installation | Point-of-entry install on the main line. Usually a plumber. |
Frequently asked
Is the EcoWater Systems ECR3700R20 NSF certified?
Yes — the EcoWater Systems ECR3700R20 is listed in the NSF certified-product database under NSF/ANSI standard 44. That means an independent body verified its claims (not just "tested to" a standard).
What does the EcoWater Systems ECR3700R20 remove?
It is certified to reduce 2 contaminants: Barium, Radium.
How often do you replace the whole-house filter?
A whole-house filter like this is typically replaced about 1 time a year. Replace on schedule — a spent cartridge stops reducing contaminants.
Compare similar whole-house filters
Source: NSF public certification listing. Specs and certified claims are from the official listing; cost figures are our estimates. Some links are affiliate links — see our disclosure.