Already have a kit?

Refill 4-pack

4 more in-home microplastics tests. You get the parts a test uses up — the staining vials and the syringe filters. Everything else from your kit gets reused.

$7.00 a test

Don't have a kit yet? Start with the full kit — $75 →

The Water Test kit — the refill replaces the vials and filters

What's in the 4-pack

A refill is 4 tests — no equipment. One sample uses up one test.

4× staining vials

One Nile Red vial per run — nothing to mix or measure

4× syringe filters

Fresh membrane per test — no rinsing, no carry-over

Nothing you already own

Reuse the digital microscope, phone stand, and syringe

Side by side: the KIT is the reusable equipment — digital microscope, phone stand, syringe, blue light, tweezers, staining bottle. The TEST is one vial plus one filter, sealed in a bag, used up on a single sample.
The kit is the equipment and you buy it once. A test is one vial + one filter and gets used up on one sample.

Why people grab a refill

  • Re-test the same filter a few months later
  • Check the water after replacing a filter cartridge
  • Test a second source like the fridge, pitcher, or bottled water
  • Cheaper per test than buying another full kit

New to the test? See how it works