Product review (2 stars): Short lived filter and not cheap
I have used my Holmes humidifier for 4 years (winter time only) and have put many filters in it during that time. I appreciate that Holmes has to make a profit from their products, but this is too much. The filter lasted less than 2 weeks, and I am confident that my water has not changed since the prior filter.  I hope someone else is making a useful replacement.  I cannot suggest you buy this product.