These filters work but do not last 3 months as advertised making them quite expensive for what they are. These are definitely the ones that need changing every 30 days. After looking at reviews that said these might not be higher quality filters that last the advertised 3 months, I decided to take a chance and buy anyway. I was wrong. While they work like clockwork for a month, they need to be changed. I wouldn't bother to think about it, but my previous set of filters took time, so it's pretty noticeable. Considering the price, there are other filters of similar quality at a lower price, so I wouldn't recommend them.
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