AquaTru Under Sink Reverse Osmosis vs ProOne Big+ Gravity Water Filter
AquaTru Under Sink Reverse Osmosis vs ProOne Big+ Gravity Water Filter compared spec-by-spec. Filtration performance, flow rate, pricing, pros, cons, and our verdict on which water filter to buy.
| Specification | A — aquatru AquaTru Under Sink Reverse Osmosis 8.5/10 $395
Price unavailable
| |
|---|---|---|
| Filter Type | under-sink reverse osmosis | gravity |
| Contaminants Removed | PFAS, plus 84 total certified contaminants | bacteria, protozoa, chlorine, lead, PFAS, microplastics, pesticides, pharmaceuticals, heavy metals, VOCs |
| Contaminants Certified Removed | 84 | — |
| Smart Leak Detection | Yes | — |
| Virus Removal | Yes | No |
| Capacity Gallons | — | 3 |
| Flow Rate Gph | — | 2.75 |
| Filter Life Gallons | — | 1,000 |
| Filter Elements Included | — | 2 |
| Max Filter Elements | — | 3 |
| Filter Element | — | ProOne G3.0 7-inch |
| Requires Power | — | No |
| Material | — | 304 stainless steel |
| Height Inches | — | 22.75 |
| Diameter Inches | — | 9 |
| Weight | — | 10 lbs |
| Serves People | — | 4+ |
| Iapmo Certified | — | Yes |
Buy the AquaTru Under Sink Reverse Osmosis
Best prices · Updated hourly
Buy the ProOne Big+ Gravity Water Filter
Best prices · Updated hourly
Who Should Buy the AquaTru Under Sink Reverse Osmosis?
The AquaTru Under Sink Reverse Osmosis is designed for well water off grid, family use, under sink reverse osmosis. As a under-sink reverse osmosis, it removes viruses, bacteria, and protozoa for true purification-level protection.
Key advantages include: reverse-osmosis membrane certified to remove 84 contaminants, including pfas; under-sink install keeps the counter clear versus the countertop aquatru; smart leak detection guards against under-cabinet water damage.
Priced at $395, the AquaTru Under Sink Reverse Osmosis scores 8.5/10 in our testing — an excellent performer across our key metrics.
Who Should Buy the ProOne Big+ Gravity Water Filter?
The ProOne Big+ Gravity Water Filter is designed for gravity fed cabin, emergency preparedness. As a gravity, it handles bacteria and protozoa — appropriate for most backcountry and domestic use cases.
Key advantages include: iapmo certified to reduce lead, total pfas, microplastics, and chlorine; 3-gallon capacity serves households of 4+ people easily; 304 stainless steel construction is durable and easy to clean. At 10 lbs, it's better suited for basecamp or vehicle-based use.
Priced at $280, the ProOne Big+ Gravity Water Filter scores 8.5/10 in our testing — an excellent performer across our key metrics.
How Do the Specs Compare?
Filter type: The AquaTru Under Sink Reverse Osmosis is a under-sink reverse osmosis while the ProOne Big+ Gravity Water Filter is a gravity. Different filter types suit different scenarios — consider your primary use case when choosing between them.
Filtration performance: The AquaTru Under Sink Reverse Osmosis scores higher on filtration at 9.5/10 versus 9/10 for the ProOne Big+ Gravity Water Filter. The AquaTru Under Sink Reverse Osmosis's virus removal capability is the key differentiator — essential for international travel or emergency scenarios where source water quality is unknown.
Price: The ProOne Big+ Gravity Water Filter costs $280 versus $395 for the AquaTru Under Sink Reverse Osmosis — a $115 difference. If the pricier unit offers significantly better filtration performance or longer filter life, the upfront cost difference often pays for itself over time.
🏆 Our Verdict
Choose the AquaTru Under Sink Reverse Osmosis if you need top-tier filtration performance and premium build quality and features.
Choose the ProOne Big+ Gravity Water Filter if you prioritize value (typically $115 less) .
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