Sift
Targeting microplastic filtration to 0.2 µm · certification in progress
Drink clean · keep it cleaner
The cleanest bottle you'll ever own.About240,000plastic particles are floating in every liter of bottled water.Finally, a filter straw you can throw in the dishwasher.From the water to your lips, only glass and metal.Your pitcher filter doesn't catch microplastics.2024 study: microplastics in arteries, 4.5× more strokes.
Glass, steel, and silicone — the only materials your water ever touches. A washable filter bottle, rethought from the inside out.And the straw on your filter bottle? Probably still plastic. We're building the opposite — a glass-and-metal filter straw and cup you can actually keep clean.No weekly salt-water soaks. No hidden valves growing mold. It comes fully apart, washes clean, and the filter just swaps out.Most filter bottles still pour your drink over a plastic lid, valve, and mouthpiece. Ours never lets your water touch petroleum plastic.Brita-style filters were designed in the 1940s for chlorine and lead. They miss anything under 5 µm — including every microplastic particle. Sift's filter targets down to 0.2 µm.A peer-reviewed study (NEJM, 2024) found plastic particles in over half of patient arteries — and 4.5× the heart-attack rate. Sift targets microplastics down to 0.2 µm, what your tap filter misses.
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Targeting microplastic filtration to 0.2 µm · third-party certification in progress
Join the first 1,000 founders — founding pricing, first production access & an extra filter pack.
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Hidden valves. Threaded ridges where mold hides. Soft plastic mouthpieces that yellow in the dishwasher. Every filter bottle on Amazon comes with the same "rinse with vinegar weekly" disclaimer — they were never designed to be cleaned, only maintained.
Sift comes fully apart in six pieces. Glass, steel, silicone, filter. Top rack of the dishwasher with your mugs. No tools. No salt soaks. No instruction card.
Top-rack dishwasher safe
Comes apart in 6 pieces, no tools
Nowhere for mold to hide
The problem
Your water is only as clean as what it touches.
The ordinary bottle
Plastic straw & lid touch your water
Hidden parts where mold can hide
Microplastics & unknown chemicals, over time
vs
Sift
Only glass, steel & silicone touch your water
Comes fully apart — nothing to hide
Pure materials, inside and out
Stop drinking through plastic.
What we get right
Three things every other filter straw gets wrong.
It comes apart into six parts — glass, steel and silicone — so every surface actually gets clean.
6 parts · fully disassemblable
01
Washable, never moldy
Comes fully apart. Dishwasher-safe and boil-safe — no salt-water soaks, no hidden valves quietly growing mold.
02
Only glass & metal touch your water
Borosilicate glass, food-grade steel, and a platinum-cured silicone tip. Your drink never runs over petroleum plastic.
Silicone is a silicone elastomer — not a petroleum plastic like PET/PP/PE. We'll show exactly what every part is made of.
03
Replaceable filter
Swap the cartridge, keep the cup. Cheaper over time — and far less waste than tossing the whole straw.
04
A clean mouthpiece, always
A clear glass cap twists on over the mouthpiece — so it won't fall off, nothing touches the part that meets your lips, and its flat top doubles as a little cup.
The part everyone hates
Finally, a bottle you can actually clean.
Most filter straws trap mold in valves and crevices you can't reach — makers literally tell you to soak them in salt water, and won't cover mold under warranty. You've seen the gunk.
Sift comes apart into six pieces in seconds. Rinse every surface, run it through the dishwasher, snap it back together. No hidden parts, nowhere for mold to hide.
Comes fully apart
Dishwasher- & boil-safe
No hidden valves
What it's made of
Only materials we'd trust with our own kids' water.
Every part that touches your drink is glass, metal, or food-grade silicone — never petroleum plastic.
Borosilicate glass
Body & cap
Lab-grade glass — pure, durable, chemical-free. The body and the dust cap are both glass; nothing leaches, nothing holds odor.
304 stainless steel
Lid & straw
Food-grade and corrosion-resistant, with a knurled lid for a sure, no-slip grip.
Platinum silicone
Mouthpiece & seals
Food-grade, platinum-cured — soft on your lips, and a silicone elastomer, not a petroleum plastic.
Replaceable filter
The filter
A food-grade, swappable cartridge — built to refine your water, trapping fine particles, chlorine, and off-tastes.
How it filters — from the inside out
1
Fill
Pour water straight into the borosilicate glass body.
2
Sip
Water is drawn through the replaceable filter inside — fine particles, chlorine, and odor caught on the way.
3
Clean water up
It rises through the steel straw to the silicone tip — never touching petroleum plastic.
How we compare
How it's different from what's out there.
Typical filter straw (e.g. LifeStraw)
Sift
Cleaning
Weekly disassembly, salt-water soaks
Comes apart → dishwasher-safe
Mold
Common complaint; not covered by warranty
Designed to come fully clean
Filter
Whole straw disposable
Swap the cartridge
Water path
Plastic bottle, lid & mouthpiece
Glass & metal only
Comparison based on public product specs and reviews. We're targeting microplastic filtration to 0.2 µm — see "What we won't claim" below.
In the wild
Made for everywhere you actually drink.
From the founder
I'm an engineer — and a dad.
A Huberman Lab episode on microplastics is what made me stop and pay attention. I'd heard the word before, but never took it seriously — so I started digging, and found a problem hiding in plain sight.
Where I live in New Jersey, everyone knows the tap water isn't perfect — PFAS and all — so we put filters on the kitchen sink. And then we hand our kids water in a plastic cup, every single day. I kept trying to switch us over to glass and metal, but the habit always slid back.
The closest fix I could find was a LifeStraw — but it's pricey, built for the backcountry, and made mostly to kill bacteria. In a city, bacteria isn't the problem. Microplastics are — and almost no one is building for it.
So I decided to. I'm an electrical engineer — I spent years building train-control signaling systems (I even wrote the book on it), and I'm a senior researcher at Rutgers CAIT. My current startup builds automated microgreens growers, where I already work with food-grade filtration and the supply chain to source it. I have what it takes to make this right.
I'm building the bottle I want for my son. If you've ever filtered your water at home only to drink it through plastic — it's for you too.
— Francisco Wang, founder
The research
Why we're not waiting for certainty.
The science on microplastics is young — but it's adding up fast. In just the last few years, researchers have found plastic particles where they really shouldn't be.
~240,000 plastic particles in a single liter of bottled water — most of them nanoplastics.
We're not claiming a bottle protects your health — the research is still emerging, and we won't pretend otherwise. But it's enough that we'd rather our water touched only glass and metal. For a clear, accessible overview, we recommend this episode:
We're validating real demand before we make a single unit. The first 1,000 founders get:
Founding-member pricing
First production access
An extra filter pack
A say in the final design
No spam — just build updates. Unsubscribe anytime.
You're on the list.
Welcome aboard. We'll be in touch at your address before anyone else.
Quick one — what would you pay for it?
Thanks — that helps us price it right.
Straight talk
What we won't claim.
We'll never tell you your water is "plastic-free." Micron filters can't remove nanoplastics — nothing portable can, short of reverse osmosis.
→Is Sift available to buy today?
Not yet — we're preparing our first production run. Reserve early access now and founders get first dibs (and founding pricing) before anyone else.
→Are the images real photos?
Honestly, no — they're product renderings. The bottle's exact size and look aren't finalized yet. We'll share design options with the founders list and let you vote on what you'd actually want to hold. The renderings show the direction (slim glass, knurled steel lid, glass cap, replaceable filter) — not the final piece.
→What materials touch my water?
Only borosilicate glass, 304 stainless steel, and food-grade platinum silicone. Never petroleum plastic.
→Does it remove microplastics?
The filter is being designed and tested. We're targeting microplastics down to 0.2 µm, and we'll publish third-party results before we claim it — never before.
→How often do I replace the filter?
We'll confirm the exact cadence from real-world testing. The cartridge is replaceable — swap it, keep the bottle.
→Isn't silicone a plastic?
Silicone isn't a petroleum plastic — it's a silicone elastomer, and we'll show you what every part is made of.
Sift
