Gravity vs Reverse Osmosis vs Pitcher: an Honest Comparison
Three ways to filter water at home, what each one is genuinely good at, and the trade you make when you pick one. Including where our own product loses.
Pitchers are the cheapest way to improve taste and the weakest on everything else. Reverse osmosis removes the most and asks the most of your plumbing. Gravity sits between them, and is the only one of the three you can set up in a rental in ten minutes.
Most comparison articles on this subject are written to make one option look obvious. This one is sponsored by a company that sells gravity filters, so it's fair to be suspicious of it. We've tried to write the version we'd want to read, including the parts where the other two options are the better buy.
The useful way to think about it isn't which filter is best. It's which constraint you're actually working around: money, plumbing, space, or how much you want removed.
The pitcher: cheap, easy, limited
A carbon pitcher costs about the same as a takeaway lunch and makes tap water taste noticeably better within a day. That's not nothing. For a lot of households it's the entire problem solved, and spending more would be spending for its own sake.
What you're buying is chlorine and taste reduction. Carbon is genuinely good at that. What you're not buying is much of a barrier to anything else, because there isn't enough contact time or enough media in a slim plastic jug to do more.
The other catch is the cartridge cycle. Four to eight weeks is typical, and replacements are priced to be bought forever. Over three years the cartridges usually cost more than the pitcher did several times over, which is the point of the business model.
Buy a pitcher if: your water is already fine and you just dislike the taste, you're in a tiny kitchen, or you need something under $40 today.
Reverse osmosis: the most thorough, and the most involved
Reverse osmosis pushes water through a membrane fine enough to hold back dissolved solids, which is the thing neither of the other two can do. If your issue is nitrates, high total dissolved solids, brackish well water or you specifically want the broadest removal available at home, RO is the honest answer and we'd tell you to buy one.
The costs are real though. It needs a permanent connection, usually a drain line and often a dedicated faucet drilled through the worktop. That's a plumber for most people and a conversation with a landlord for anyone renting. Systems also send some water to drain to flush the membrane, which matters more in some states than others.
It's also indiscriminate. RO strips calcium and magnesium along with everything else, which is why many systems add a remineralisation stage back in at the end. Some people want that; others find the water tastes flat without it.
Buy reverse osmosis if: you own the property, your water report shows dissolved solids or nitrates, and you're comfortable with installation and a yearly service habit.
Gravity: the middle path, and what it gives up
A gravity system is two stainless chambers and a set of elements. You pour water in the top, it works its way down through carbon and an ultrafiltration membrane, and it collects in the bottom. There's no pump, no cartridge lock and nothing to install.
Because the elements are large and the water moves slowly, there's far more contact time than a pitcher gets. That's what lets the same format handle chlorine, lead, trace metals, sediment, bacteria and cysts rather than taste alone.
Now the honest part. It takes up counter space, and it's tall enough that you should measure the gap under your wall cabinets before ordering. It filters at its own pace instead of on demand, so you refill it rather than turning a tap. And it does not remove dissolved salts or reduce hardness, which is the exact thing RO is for.
Buy gravity if: you rent, you move often, you want more than taste filtering, or you want something that still works when the power is out.
Side by side on the things that matter
Stripped of marketing language, the three formats differ on six practical points.
Pitcher: none. Gravity: none, about ten minutes to assemble. RO: plumbing, usually a drain line, often a drilled faucet.
Pitcher: chlorine and taste. Gravity: chlorine, lead, trace metals, sediment, bacteria and cysts. RO: all of that plus dissolved solids.
Pitcher: four to eight weeks. Gravity: six to twelve months. RO: six months to two years depending on the stage.
Pitcher: yes. Gravity: yes. RO: no, and most systems stop entirely in an outage.
Pitcher: yes. Gravity: yes, it packs back into the box. RO: technically, but it means uninstalling and reinstalling.
Pitcher: capacity and scope. Gravity: counter space and no hardness reduction. RO: installation, water sent to drain, and mineral stripping.
Read that list twice and the decision usually makes itself. If the blocking issue is plumbing, RO is out. If the blocking issue is dissolved solids, gravity is out. Most people are in neither camp and end up choosing on cost and convenience.
The five year cost, which is where it gets interesting
Purchase price is the number people compare and the one that matters least. Rough five year totals for a household drinking around four litres a day, before any installation labour.
The three filter options land closer together than the sticker prices suggest. The pitcher looks cheapest on day one and is roughly line ball by year four. RO carries installation labour on top, which can be a few hundred more depending on the kitchen.
Bottled delivery is the outlier, and it's the habit most of our customers are actually replacing.
So which one should you buy
If you own your home, your water report shows high dissolved solids or nitrates, and installation doesn't put you off, buy reverse osmosis. It removes more than we do and we're not going to pretend otherwise.
If your water is already good and you only want it to taste better, buy a pitcher and spend the difference on something else.
If you rent, move every couple of years, want more than taste filtering, or want something that keeps working in an outage, a gravity system is the one that fits the constraint. That's the case we'd make for ours.
The manufacturing facility is recognised by NSF International as complying with NSF/ANSI 42, and the materials carry FDA 21 CFR food contact, RoHS, LFGB, CE and ISO 9001 test reports.
Facility recognition under NSF/ANSI 42 is not the same as product level NSF certification, and reduction figures come from the manufacturer's own commissioned testing. Documents available on request.
AquaPura 2.25 Gal Gravity Fed 304 Stainless Steel Water Filter
Your questions, answered
You can, but there's little point. The gravity system already does everything the pitcher does and more, so the pitcher becomes a jug you refill from the tap below it.
No. Hardness is dissolved calcium and magnesium, and carbon and UF leave those in place. If limescale in the kettle is your main complaint, you want a softener or reverse osmosis rather than this.
Our unit is 7.5 by 7.5 inches on the base and 18 inches tall. It clears most wall cabinets, but measure the counter to cabinet height if your kitchen is tight.
Several hours for a full fill, which is why most people top it up in the evening and have it ready by morning. It isn't instant like a tap, and that's the main adjustment people make.
Most people get the overwhelming majority of their minerals from food rather than water, so this is generally a taste question rather than a health one. Plenty of RO systems add a remineralisation stage if you prefer it.
If gravity is the one that fits, here's ours.
$263 today, down from $373. Free US shipping.
Shop the AquaPura filterSponsored content produced for AquaPura. Reduction figures come from testing commissioned by the manufacturer at the Guangdong Detection Center of Microbiology against CJ 94-2005 (2020). Comparative descriptions and cost ranges refer to general product categories at time of writing and vary by brand, household and local water quality. This page is not medical advice and is not a substitute for testing your own supply.