In this video I do an 8-month real-world check on the Costco Winix C610 air purifier, because the big question is always the same: is the HEPA filter actually “done,” or is it just dirty and still usable? I pull the filter out, show you what it looks like after regular use, and talk through what that condition means for performance. This isn’t a quick unboxing—this is the long-term update most people want before they spend money on replacement filters. I also get into the practical side: what it costs to replace the filter, whether the C610 still makes sense as a Costco buy, and how I personally think about filter life versus what the reset light suggests. If you already own the Winix C610 (or you’re deciding between this and something like the Winix T810), this update gives you a realistic expectation of what you’ll be dealing with months down the road—pros, cons, and whether I think it’s worth replacing the filter or rethinking your setup.