The cleanest pitcher water there is. Closest thing to reverse osmosis.
Pulls hormones, chlorine, microplastics, lead, and PFAS — everything Brita and basic pitchers leave in. No plumbing, no install, minerals stay.
- Hormones, lead, PFAS — pulled out
- Microplastics, chlorine, pesticides — pulled out
- Minerals — stay
We don’t grade our own homework.
Production-line pitchers sent to an independent, accredited laboratory. Full NSF/ANSI 53 + 401 + P473 protocols. Public certification on file. Re-tested every year — results published, pass or fail.
Nanoplastics under 0.5 µm. Bacterial contamination. Hexavalent chromium. Radium. The next testing round covers these and we’ll publish the results — pass, fail, or middling. We only claim what’s measured.
Stop tab-hopping. Here’s the table.
The four products you’re weighing Osma against. Public spec sheets, May 2026. No strawmen.
| Osma | Brita Elite | Berkey | Reverse Osmosis | |
|---|---|---|---|---|
| Starting price | $109 | $40 | $160 | $400+ |
| 3-year total cost | $367 | $508 | $760 | $1,300+ |
| Requires installation | No | No | No | Yes |
| Renter-friendly | Yes | Yes | Yes | Limited |
| Fluoride | Yes | No | Add-on filter | Yes |
| Lead | 99.1% | Partial | Yes | Yes |
| PFAS NSF 401 contaminants tested | 15+ | 3 only | Not certified | Varies |
| Microplastics | 0.5 µm | Partial | Yes | Yes |
| Retains minerals | ~95% | Yes | Yes | Strips all |
| Wastes water | No | No | No | 3:1 ratio |
| Lifetime pitcher warranty | Yes | No | Limited | No |
| Regulatory standing | Clear | Clear | EPA stop-sale 2024 | Clear |
You’ve seen the four. You only need one.
Brita leaves fluoride and PFAS in. Berkey is under EPA stop-sale. RO needs a plumber and strips your minerals. Osma is the one row of green — starting at $109, with a 30-day return and lifetime pitcher warranty.
Three things your pitcher should already be doing.
The headline contaminants. Eleven minutes. One pour.
There is no safe level of lead for a child. Doesn’t matter where your pipes are from.
The “forever chemicals” the EPA finally regulated in 2024. Osma already meets the limit.
Water tastes alive, not flat like RO or distilled. Toxins out, minerals in.
- Fluoride · selective ion exchange · < 0.1 ppm
- Chlorine + chloramines · 94% reduction
- Microplastics · 0.5 µm retention
- 15+ pesticides + pharmaceuticals · NSF/ANSI 401 panel
Four media. One cartridge. Zero plumbing.
How a countertop pitcher does the work of a $400 under-sink system.
Pre-filter 5 µm
Catches rust, sand, sediment from your pipes.
Carbon block 0.5 µm
Pulls chlorine, pesticides, pharmaceuticals, microplastics.
KDF + ATS redox copper-zinc + titanium
Binds lead and other heavy metals. This is how we hit NSF/ANSI 53.
Selective ion exchange fluoride out, minerals in
Grabs fluoride. Leaves magnesium and calcium alone.
Mineral retention ~95% magnesium + calcium
Water waste Zero — no reject stream
What you actually get.
Specifications, materials, what ships in the box.
Cheaper than bottled. Cheaper than Brita. Cleaner than both.
Three years from now, Osma costs less than what’s currently on your counter — and that’s before you count what you stop hauling up the stairs.
| Bottled water (1 gal/day) | $1,460 |
|---|---|
| Brita Elite + filters | $508 |
| Berkey + replacement filters | $760 |
| Osma + filters | $367 |
| Reverse osmosis (installed) | $1,300+ |
Math: Osma bundle (3 filters included) + 9 standalone replacement filters at $32. Brita: $40 + 24 filters at $13. Berkey: $160 + 2 filters at $50 × 3. RO: $400 install + $300/year in membranes.
don’t drink from this year
(if you’d been buying bottled)
per single $32 cartridge
150 gallons per filter = 567 litres = 1,135 of those 0.5 L bottles you’d otherwise carry, recycle, or landfill.
Two numbers your water utility won’t text you.
through lead pipes
EPA, 2024. Full replacement isn’t scheduled until 2034. Your kids drink water today.
certified to NSF/ANSI 401 for PFAS
NSF listing, May 2026. The category skipped the test. Osma took it.
If Osma isn’t right for you, we’ll say so.
The fastest way to lose your trust is to sell you the wrong thing. So here’s the deal.
This is for you if…
- You’re on city water and you want out of mandatory fluoridation.
- Your building is older than 1986 — which means lead pipes or lead solder.
- You rent, and a plumber under the sink isn’t happening.
- You’ve read enough about PFAS to want it gone, not “addressed”.
- You owned a Berkey and went looking after the 2024 EPA stop-sale.
- You’re done carrying bottled water — for the cost, the plastic, or both.
This isn’t for you if…
- You’re on well water with bacteria — buy UV, not Osma.
- Your real complaint is limescale — buy a softener.
- You want absolute maximum removal at any cost — pay the plumber, get RO.
- You’re not actually going to switch off bottled — wait until you are.
- You’re optimizing only for sticker price — a basic carbon pitcher will be cheaper.
4.8 stars. The bad ones still on the page.
Nothing scrubbed, nothing hidden. The 3-star review below is the most useful one we’ve ever received — read it first.
“Filter died fast in our hard water.”
Producer says 150 gallons; we got maybe 110. Phoenix water is brutally hard. Subscription discount makes it close to a wash, but be aware. Three stars because the product is good, the lifespan claim is optimistic for hard-water markets.
“The fluoride strips don’t lie.”
Bought test strips before and after. Tap came in around 0.7 ppm. After Osma: undetectable. Three months in, no complaints. The taste in coffee is the part I didn’t expect.
“Switched after the EPA stop-sale.”
Big Berkey for six years. After the 2024 EPA action I started looking. NSF certs, fluoride confirmed by my own strips, fits in the fridge. Smaller than Berkey. Fine with that — it filters in 11 minutes vs 8 hours.
“My kid drinks tap now.”
1971 building, old service lines. My eight-year-old refused tap, period. Switched, didn’t tell her, she drank a glass and asked for more. That’s it. That’s the review.
“Slower than my old Brita. Worth it.”
Takes ~11 minutes to fill the pitcher. Plan ahead — fill before bed. If you need water RIGHT NOW it’s annoying. Not docking stars for that — gravity filtration physics. The third-party verification is what got me.
“Receipts, not vibes.”
Most filter brands wave a logo at you. Osma points you at the actual NSF listing and walks through the testing protocol stage by stage. That’s the difference. Bought without overthinking it.
The questions you were about to email us anyway.
If something here is missing, email hi@osma.com. We’ll add it. The founders read every message.
Will it actually fit in my fridge?
What does “NSF/ANSI 401 certified” actually mean?
Does one filter really last four months?
Is mold going to grow in this thing?
Can I run hot water through it for tea?
Why is it slower than my old Brita?
What’s it made of? BPA-free?
What does “lifetime warranty” actually cover?
I’m on well water — does Osma work for me?
Still not sure if it’s right for you?
Just need filters. Skip the pitcher.
For returning customers. Same filter, sold without the pitcher. Standard or bulk.
First time here? Get the pitcher bundle instead →
We built Osma because we couldn’t find one we’d give our own kids.
Brita left the fluoride and PFAS in. Berkey was huge, slow, and now under EPA stop-sale. RO needed a plumber and stripped every mineral with it. Nothing on the shelf passed the test we’d set for our own families — so we engineered one that did, certified it to NSF/ANSI 53 and 401, and committed to retesting every year and publishing the results.
Every customer email lands in one of our inboxes. Write to us — one of us writes back.
30 days to decide. A lifetime of clean water if you keep it.
Don’t like it inside the first month? Ship it back, we pay postage. Only 3% of buyers do. Lifetime warranty on the pitcher, free US shipping over $50. The risk is on us.