Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Makes it worse

I used to buy these for the humidifier in my room and the one in my daughters room. I had to clean the humidifiers every week because the filters would start growing mold and mildew on them. I just assumed this was normal because I used these right from the beginning. One month we were out and I forgot to order them. Guess what..... No black mold and mildew on the filter after a week. I quit using them and I can go 2 weeks without cleaning my humidifier. I don't really like to, but I can if I need to. Before I had no choice but to clean them every week because the filters got so bad.