At-home microplastics test kit
Test the water you actually drink.
Use two tests to compare tap, filtered, fridge, pitcher, or bottled water. Pink dots show plastic particles. Upload the photos and we count them for you.
Real test photo
Pink dots = plastic particles
The question
Is the filtered water actually cleaner?
The test
Use one kit to compare any two waters.
The answer
We help you understand what the photos show.
Real results
Some filters remove microplastics. Some do not.
These are real customer tests from Los Angeles. The point is simple: test the water you actually drink.
This RO system was doing its job.
An under-sink RO system in Fox Hills came back at 2 and 5 particles across two tests.
See Fox Hills
This whole-house filter held up.
A Santa Monica whole-house system came back at 8 and 9 particles across two samples.
See Ocean Park
This fridge filter barely changed the water.
A Pacific Palisades fridge filter came back close to unfiltered tap. The family thought the kids were drinking filtered water.
See Pacific Palisades
What people test
Test the water your house actually uses.
Baby bottles
Compare tap water with the water you use for formula.
See whether the filtered water has fewer particles than the tap.
Fridge water
Check the dispenser everyone uses every day.
Fridge filters are easy to trust and easy to forget.
New filter
Test before and after you install or replace it.
Keep the photos and counts so you know what changed.
Bottled water
Compare the bottle to what comes from your sink.
Sometimes the answer is not what you expect.
Bottled water sample
One real test. Not a stock image.
Cleaner sample
The comparison is the point.
“New baby, kept stressing about making formula with tap water. Tested the tap and our Brita. The Brita came back a lot cleaner, so that is what we use now.”
“Had an under-sink filter for years and just trusted it. Tested the tap and filtered side. Filtered came back way cleaner. Good to know.”
“Now I run a test on the tap before and one on the filtered line after, then show the customer both photos. It makes the job obvious.”
“I keep one in the truck. With old pipes, the photo usually says more than I can.”
From cup to count in about an hour.
About 10 minutes of hands-on work. The rest is waiting.
01
Collect two samples
Tap water and filtered water, or any two sources you want to compare.
02
Run the kit
Add the stain, push the water through the filter, and shine the blue light.
03
Upload the photos
Pink dots show plastic particles. We count them and send your result.
Everything ships in the box.
Run the test at home. Upload photos when you are done.
Confidence
Built on published fluorescence chemistry.
The kit uses Nile Red fluorescence staining, a method used in published microplastics research. We packaged the workflow so you can run it at home and upload photos for counting.
Based on Leonard et al. 2022, Journal of Hazardous Materials Letters. Read the paper.
What the test can tell you
- How many visible particles were caught on your filter
- Whether filtered water looks cleaner than tap
- How your sample compares with other homes we have tested
- Whether a filter change or install made a visible difference
Follow along
See what we are finding each week.
New filter results, particle counts, and photos worth seeing. No spam.
No spam. Unsubscribe anytime.
Common questions
What does the kit test?
It shows plastic-like particles caught on a filter. Pink dots are counted from the photos you upload.
Can I test my filter?
Yes. That is the main use case. Test your tap, then test the filtered water, and compare the counts.
What if I do not have a filter yet?
Test your tap first. If you install a filter later, you will have a real before-and-after.
Is it hard to run?
No. If you can fill a glass and follow instructions, you can run it. It takes about 10 minutes of hands-on work.
More questions? See the full FAQ or read about how it works.