Although labeled as a replacement for my nv501 they are smaller than the original filters. The taller foam filter is comparable in height to the original, which filled the entire lower bowl from rim to rim, but was narrower or thinner. This leaves about 1/4 inch play around the perimeter. The thin bottom foam filter is slightly thinner (pictured left and less than 1/2 the height of the original filter, pictured right) so I don't think it will be as effective at filtering fine particles as the filter. Original. The material of the replacement bottom filter also differs from the material of the original filter. I'll try them, but they don't match the real size filters, so I'm not sure if they're as effective at filtering as the real thing.
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