Somehow we managed to live more than 15 years without knowing what those empty slots above our honeywell electrostatic filter were, although over time our three technicians came to clean them. It turns out they were post filters. My wife, unhappy with the air quality in the middle of the pollen season, advised me to look into these air purification towers, but I thought why do we need them when we have an electrostatic precipitator? I studied electrostatic air filtration, how it works, and realized, damn it, we were missing one component, those post-filters. After installation - they stood perfectly - even after less than a day we could see that they are doing their job, filtering out smaller particles that received a charge but did not make it into our system. Wonderful! Now a few weeks later we are so glad we got them and only wish we had known about it much sooner. PS-They have been listed as out of stock and we will not receive them for about 2 weeks. It was good, but it turns out we received them in 4 days. This is customer service now!
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