ProOne Big+ 3-Gallon review
By Daryna Klochko · Published · Specs checked Oct 15, 2026 · 
Scores 9.25/10, tied for 5th of the 18 gravity filters we track. At $183.96 it costs less than the category median of $249. ProOne also claims Fluoride, which is not in the listing. The 1 independent test we analyzed for it is tied for the most of the 18 gravity filters in the category.
A certified health claim: IAPMO lists it for Chlorine, Chloramine, Lead, one of 7 among the 18 gravity filters
Running costs matter: about $426 a year in cartridges, 2.5 times the category median
- Price
- $183.96
- Certified for
- Lead · PFAS · Microplastics +2
- Flow
- Not stated
- Cartridge life
- 50 gal
- Cost per year
- $426
- Warranty
- 5 years (limited)
Certification
Listed by IAPMO under NSF/ANSI 42 · 53 · 401 for Chlorine, Chloramine, Lead, Total PFAS, Microplastics, checked Oct 15, 2026. ProOne also claims 1 more substance that is not in the listing. Search the IAPMO listings
- Chlorine
- Chloramine
- Lead
- Total PFAS
- Microplastics
ProOne also claims Fluoride: 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
5 years limited (stainless system); filters 1 year.
Product page: all sales final; refund policy: 45 days, unopened.
Warranty: 5 years limited (stainless system); filters 1 year. Returns: Product page: all sales final; refund policy: 45 days, unopened. Shipping: not stated by the brand. Source: ProOne data sheet, checked Oct 15, 2026.
Source: ProOne data sheet, checked Oct 15, 2026.
Compared with similar gravity filters
All 18 gravity filters →| Model | Price | Certified for | Cost per year | Warranty | Score | Where to buy |
|---|---|---|---|---|---|---|
| Culligan MaxClear Scout 2.25-Gallon | $175 | Lead · PFAS +3 | $382 | 5 years (limited) | 9.25/10 | Check price → |
| Santevia Gravity Water System | $179.99 | Brand claims only | $214 | 10 years (limited) | 9.25/10 | Check price → |
| ProOne Big+ 3-GallonTHIS MODEL | $183.96 | Lead · PFAS +3 | $426 | 5 years (limited) | 9.25/10 | |
| Culligan MaxClear Venture 3-Gallon | $199 | Lead · PFAS +3 | $382 | 5 years (limited) | 9.25/10 | Check price → |
| Waterdrop King Tank 2.25-Gallon | $199.99 | Brand claims only | $35 | 1 year | 8.75/10 | Check price → |
What owners say
Checked Oct 15, 20264.2/5 from 519 ratings on Amazon. In our score this is 1.75 of 2 points. How we score
- Quality88 mentions74 positive14 negative
- Water taste51 mentions42 positive9 negative
- Reliability43 mentions29 positive14 negative
- Value for money43 mentions26 positive17 negative
- Filtration speed27 mentions11 positive16 negative
- Assembly21 mentions19 positive2 negative
- Filter durability15 mentions8 positive7 negative
Store ratings change over time; the date shows when we checked.
