Refillable Carbon Filter Kit 4” with Additional Refill, Odor Removal Air Scrubber For 4" Inline Fan and Ducting, Reusable Charcoal Filter for Grow Tent Grow Room Hydroponics

I have already saved so much money with refills.

Top Aktivkohlefilter – leise & effektiv! Der AC Infinity Filter entfernt Gerüche zuverlässig und läuft sehr ruhig. Verarbeitung wirkt hochwertig, Montage ist einfach. Nach Wochen Dauereinsatz immer noch top Leistung – klare Empfehlung für Growräume! 🌿💨

The size is exactly what I ordered, its very cost efficient! The fan quality is amazing to keep my house fresh. It was super easy to install and took me 2 minutes to set up! Its quiet but also has a low sound that let's me know its working . I use it for my dont boarding business, its very functional

There was a mistake in my order, but I am very satisfied with how AC infinity dealt with it - unfortunately, AMAZON makes it very difficult to communicate directly and efficiently, or to even find my old, less positive review - so take it with a grain of salt - this is a good company with excellent customer service, and a great product.

What can I say. This is a great idea. Cost effective in the long run, and helps keep them out of the landfills. Win win from the best growing company out there!