Review on 🔍 Fette Filter - Pack of 6 Humidifier Wicking Filters Compatible with Holmes HWF65, HWF65PDQ-U - Filter C - Effective Moisture Control by Justin Verslues

I've used these filters during the colder months and learned this: Before installing a new filter, pour some cold water down the sink and submerge the filter in the water. Leave it under water for a few minutes. Remove from the water and place in the humidifier. Every 3 or 4 days, remove the filter housing and turn the filter upside down, reinsert it and turn on the unit. This improves the efficiency of the absorbing filter. If you continue to find that the filter does not absorb moisture, remove the filter, soak in water again, and if the filter has hardened yellow rings, add a cup of white vinegar to the soaking water and gently squeeze filter. a few minutes up and down. Leave for one to two hours. Rinse and place back in the humidifier. If your water is harder than soft, this yellow line can appear fairly quickly. To be honest, this whole process is a bit annoying, but you can make better use of the filter. Jeanne from St Louis.