Product · April 17, 2026
The world's first at-home microplastics test kit — $50, two tests, results in about ten minutes.
Every other microplastics test on the market is a lab service. You mail a sample to a technician, wait two to four weeks, pay $600 to $800, and a PDF arrives. This is different. This is a microplastics test kit you run on your own table. Stain. Filter. Shine a blue light. Plastic glows pink. Count the dots.
Real result from a customer sample. Each pink dot is a plastic particle stained with Nile Red, fluorescing under a 450nm blue LED.
What a microplastics test kit actually is
A microplastics test kit is a box of the consumables and tools you need to detect plastic particles in water without a lab. Ours contains: two pre-filled hydrogen peroxide vials (for digesting organic matter), two pre-filled Nile Red dye vials, two 25mm PTFE syringe filters, a syringe, a viewing cup, a phone-clip orange filter, and a blue LED. That's one kit — two complete tests.
The method is the same one used in university microplastics research. Nile Red fluorescent dye binds to polymers (plastic) and essentially nothing else. Under a 450nm blue light, plastic glows bright pink. Salts, minerals, tea residue, and biofilm do not. You can count the particles with the naked eye, or upload a photo of the filter to thewatertest.com and get an automated particle count plus a map pin.
What's in the box: two-test kit, syringe filter cap, phone clip, viewing lens.
How it works
Four steps. Ten minutes of hands-on work. An hour of unattended waiting while the dye binds.
Digest
Add the H2O2 vial to 100 mL of your sample, swirl, wait 30 minutes. This breaks down organic matter — tea leaves, sediment, biofilm — so it doesn't clog the filter or fool the dye.
Stain
Add the Nile Red vial. The fluorescent dye binds to plastic and nothing else — not minerals, not salts, not tannins. 30 minutes to fully bind.
Filter
Push the whole sample through the 25mm PTFE filter in the syringe. Plastic particles get trapped on the disc face. Fast push, clean result.
Glow
Clip the orange filter on your phone camera, shine the blue LED at the disc. Every pink dot is a piece of plastic. Take a photo, upload it, get a count.
Full method writeup with references: How It Works.
Why it's the cheapest microplastics test kit you can get
If you wanted to test your water for microplastics before this kit existed, you had three options, all painful:
- Tap Score (mytapscore.com). $598–$835 per sample. Mail-in, 2–4 week turnaround.
- Measurlabs. $679–$797 per sample. py-GC/MS polymer analysis. Designed for industry, not consumers.
- The Moore Institute / accredited labs. $500+ per sample. FTIR/Raman. Weeks of queue time.
At $50 for two tests, The Water Test is roughly 12 to 16 times cheaper per sample than the next option. Not a small delta. An order of magnitude. The reason it costs this much less: you're doing the pipetting, filtering, and photo upload yourself. The lab process is the same — we moved it to your table.
| At-home kit | Lab test | |
|---|---|---|
| Price | $50 (2 tests) | $598–$835 per sample |
| Turnaround | 10 minutes on your table | 2–4 weeks mail-in + lab queue |
| Who runs it | You do. Your eyes, your phone. | A technician you'll never meet. |
| What you test | Anything you can pour — water, tea, filters, bottles | Usually a single pre-approved water source |
| How many times | As many kits as you want. Run side-by-sides. | One per invoice. |
What the results actually look like
Two filters from real customer tests. One is a baseline — a clean reference sample we process the same way as every other. The other is a one-year-old plastic water bottle, the kind that sits in a car, cracks, and gets forgotten. Same dye, same filter, same light.
One-year-old plastic bottle. Dense field of pink.
Baseline reference. Almost nothing to count.
You don't need a microscope. You don't need a degree. You can hand both filters to a stranger and they will pick the bottle sample every time.
What you can test with it
Anything you can pour 100 mL of. The kit is not a water-quality meter. It's an experiment platform for anything you're suspicious of.
- Tap water vs the filter you paid $200 for (pitcher, RO, whole-house, fridge)
- Bottled water — any brand. Run a fresh bottle and one that sat in your car for a year.
- Brewed tea. Pyramid bags are plastic mesh. Paper bags often have a polypropylene heat-seal.
- Coffee from a pod machine, a plastic kettle, or a paper cup with a plastic lining
- Your shower head, your gym bottle, the water at a hotel
- A sample from a river, a rain barrel, a reservoir, the ocean
Microplastics test kit FAQ
Is this really the world's first at-home microplastics testing kit?
Yes. Every other consumer microplastics test we've found is a mail-in lab service. Tap Score, Measurlabs, the Moore Institute — you collect a sample, ship it, wait weeks, receive a PDF. The Water Test is the first product where the consumable, the filter, the staining chemistry, and the detection optics all sit in a single box on your table.
How is the kit accurate without a lab microscope?
The accuracy lives in the chemistry, not the optics. Nile Red is specific to polymers. If a particle glows pink under 450nm blue light after staining and filtration, it's plastic. The filter's pore size (1.0 µm PTFE) determines the smallest particle you'll catch. A phone camera plus the orange long-pass filter clipped to the lens is enough to photograph the glow, and our image pipeline counts the particles automatically.
Why is it so cheap?
Because you're doing the work. The bill of materials per kit — PTFE filter, syringe, two vials of reagents, orange filter, LED — is under $10. The rest of a lab invoice is technician time, facility overhead, and a long, slow queue. Moving those steps to your table is the whole reason the price drops by 12x.
What does the kit not do?
It does not identify the specific polymer (PE vs PET vs PP) — that requires py-GC/MS or FTIR, which are five-figure instruments. It does not detect nanoplastics below the PTFE pore size. It does not test for metals, PFAS, or bacteria. It answers one question: how much plastic is in this sample.
The bottom line
If you've ever wondered what's in your water, your tea, or the $200 filter you bought — this is the cheapest, fastest way to actually find out. $50. Two tests. Ships free.