Pentair OMNIFilter RO2050 4-Stage Reverse Osmosis review
By Daryna Klochko · Published · Specs checked Oct 15, 2026 · 
Scores 9.75/10, tied for 1st of the 20 RO systems we track. At $162.23 it is the cheapest of the 20 RO systems, against a category median of $459.99. NSF lists it for Lead, Cysts, TDS, Arsenic, Fluoride, one of 12 RO systems out of 20 with a certifier listing for a health claim. Pentair also claims Chlorine, which is not in the listing.
A tight budget: $162.23, the cheapest of the 20 RO systems
- Price
- $162.23
- Certified for
- Lead · Cysts · Arsenic +9
- Flow
- Not stated
- Cartridge life
- 6-month cartridge
- Cost per year
- $78
- Warranty
- 1 year
Certification
Listed by NSF under NSF/ANSI 53 · 58 for Lead, Cysts, TDS, Arsenic, Fluoride, checked Oct 15, 2026. Pentair also claims 1 more substance that is not in the listing. Search the NSF listings
- Lead
- Cysts
- TDS
- Arsenic
- Fluoride
Pentair also claims Chlorine: brand claims, not in a certifier listing.
The contaminants or other substances removed or reduced by this water treatment device are not necessarily in your water. Listing checked on Oct 15, 2026. What a listing means and what it doesn't
Specs and sources
Checked Oct 15, 2026 · source under each valueFiltration
Cartridges and install
Buying
Warranty, returns and shipping
Warranty: 1 year. Returns: 30 days. Shipping: not stated by the brand. Source: Pentair data sheet, checked Oct 15, 2026.
Source: Pentair data sheet, checked Oct 15, 2026.
Compared with similar RO systems
All 20 RO systems →| Model | Price | Certified for | Cost per year | Warranty | Score | Where to buy |
|---|---|---|---|---|---|---|
| Pentair OMNIFilter RO2050 4-Stage Reverse OsmosisTHIS MODEL | $162.23 | Lead · Cysts +10 | $78 | 1 year | 9.75/10 | Check price → |
| Express Water RO5DX 5-Stage Reverse Osmosis System | $189.99 | TDS | $81 | 1 year | 9.75/10 | Check price → |
| APEC Water RO-90 Ultimate 5-Stage Reverse Osmosis | $264.99 | Lead · Arsenic +9 | $73 | 1 year (limited) | 9.5/10 | Check price → |
| Brio G10-U ROSL500 Tankless Reverse Osmosis System | $299.99 | Brand claims only | $290 | 1 year (limited) | 9/10 | Check price → |
| Brondell Capella RC250 Reverse Osmosis | $329.99 | Lead · Cysts +18 | $205 | 1 year limited | 9.75/10 | Check price → |
What owners say
Checked Oct 15, 20264.1/5 from 37 ratings on Amazon. In our score this is 1.75 of 2 points. How we score
- Water quality12 mentions11 positive1 negative
- Functionality9 mentions8 positive1 negative
Store ratings change over time; the date shows when we checked.