Will the Big+ gravity water filter hold enough filtered water for a household that drinks a lot every day?

We selected it for a full review because the capacity figure, not the price, decides that use case.

Why the Big+ reservoir may be too small for heavy use

That 3-gallon reservoir is the key number here, and it is why this gravity water filter matters for heavy daily use: a gravity filter stores water above the spigot, so reservoir capacity sets how often you refill. What does your household drink in a day? If you need 3 to 4 gallons, this tank is short of that load. The Big+ is a stainless steel countertop water filter with a stainless steel stand and spigot, and its NSF/ANSI-42 certification covers chlorine, taste, and odor claims.

You can find the complete ProOne Big+ review to see how the unit performs in daily use.

What to Check Before Buying the Big+

• Check your daily water use against the 3-gallon reservoir capacity.
• Check whether your source water carries enough sediment that you need a separate sediment filter first; that stage is not stated here.
• Check how often you want to replace the filter media, since the ProOne G2.0 filter lasts up to 9 months with regular daily use.
• Check your counter or RV space for a filled, all-stainless unit with a stand, because stability matters when the tank is full.
• Check whether you need NSF/ANSI-42 coverage for chlorine, taste, and odor, or a different standard for health-related contaminant claims.
• Check whether microplastics removal and mineral retention match your own water goals.

Where the Big+ Fits Among Gravity Countertop Filters

The Big+ sits in the mid-size gravity-filter group, with a 3-gallon reservoir that suits a small kitchen better than a larger household. If you want fewer refills for a family that drinks heavily all day, look at larger-capacity gravity systems instead. If you want a compact countertop or RV unit, this one is easier to place than bulkier stainless steel systems, and its included stand helps with setup. The flow rate is not stated, so buyers who care most about fast dispensing should compare alternatives on that number first.

For a side-by-side look, see how the Big+ compares to others.

Choose Big+ if you want a 3-gallon stainless steel gravity filter for a small kitchen, RV use, or moderate daily drinking. Skip it if your household needs more than 3 gallons of filtered water before the next refill.

If you are concerned about minerals, see which filters provide filtered water for well water taste.

Reviewed by the Predicament Measures editorial team.