We've only ever bought 'official' replacement filters and pre-filters for our Honeywell air purifiers, but the fact that you have to cut out the pre-filters to use them - combined with the complete fragility of them - sent me to look elsewhere. I'm very glad I did! They were great, much better quality and easy to use. It took me a minute to figure out how to set them up for the larger ones [requires same size filter and pre-filter, but they have to be stacked sideways], but they worked charmingly and are MUCH easier to access. We will buy them again in the future.
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