Product review (4 stars): How to make them last longer.
These are a good way to save money on pricey filters, but since they tend to only last half as long as brand filters, here are some tips.

*Use distilled water instead of tap. Tap water encourages growth of pink algae/orange mold.

*Wash humidifier in vinegar to kill mold, then wash again in soapy water.

*Do not wash in bleach when they get dirty; soak them in hot water & vinegar overnight & they will be spotless in the morning. Do not squeeze dry; let air dry for 2 whole days.

Unrelated tip: If you bought your humidifier for chronic dry nose, I recommend also buying a Neti Pot. Never ever use tap water in those.