DerBlue1 Sets True HEPA Filter & 4Pcs Carbon Replacement Filters A 115115 Size 21 Compatible with Winix PlasmaWave 5300 6300 5300-2 6300-2 P300 C535

I have ordered 2 of these so far and they seem to work well for about 6 months to a year depending on how often you use them. I still feel these are pretty expensive, but this is the cheapest one I could find at the time. The carbon filters last a really long time if you vacuum them. In the beginning I used the same one for about a year with no trouble. In fact at this point I think I still have like 5 of the carbon ones- so I do wish they would just make it 2 main filters and no carbon ones.

My model of Winix has a pre-filter, which this item did not include. Instead, it provided extra carbon filters. It did not fit well and you can see the dust just going around the edges of the filter. I would not buy again.

Its crazy to see what a 6 month difference can make. I'll be using this air purifier from now on!

Smaller than genuine C535 by 3mm and $18.22 cheaper

The filter is very affordable, and it lasts a year. I love the winnix system. It has helped my allergies so much, I would recommend this to anyone.

They work great in my winix purifier and the price point is so much better compared to name brand. I will continue to buy these!

Filters fit perfectly for my air purifier. Full set of filters lasts me a full year. Change the white filter once a year and the black ones 3-4 months. Would recommend.

Replaced dirty filter and use extra fiber filters as they get dusty until main filter needs replacement.