Later Date Refill

Test when the time is right.

Air quality changes. A new season, a renovation, a new pet, or a shift in your symptoms can all change what's circulating in your home. The Later Date Refill lets you test again whenever it makes sense — no rush, no coordination required.

Each refill comes with its own prepaid return label, so it's completely self-contained. Store it until you're ready, run your test, and send it back independently whenever you choose.

How many do I need? We recommend one filter per 1,000 sq ft or one filter per level each time you test. If you have a 3,000 sq ft home and want to retest all three levels down the road, order three Later Date Refills — each one arrives with its own return label, so you can return them together or separately.

When to retest:

• Seasonally — spring and fall bring different pollen and mold profiles
• After home changes — renovation, new flooring, HVAC work, or a new pet
• When symptoms shift — new or worsening allergy symptoms deserve a fresh look
• For peace of mind — confirm that improvements you've made are actually working

How it works:

1. When you're ready, swap in your refill filter and run the fan for 2 hours
2. Return the used filter using the prepaid label included with this refill. Keep the fan for later sampling.
3. Receive your updated results and compare to previous tests

What's included:

• One filter cartridge
• Individual prepaid UPS Ground return label
• Full genomic analysis of one air sample
• Digital results report

Need to test multiple rooms right now? Add an Additional Room Refill to your kit order instead — it ships back with your kit on one label, saving you the extra step.