Product review (5 stars): Unlike many decalcification cartridges this does not have ceramic beads ...
Unlike many decalcification cartridges this does not have ceramic beads.  It has about a three month limit and needs to be replaced.
At $10.00 a cartridge it is very high for a small humidifier if you have hard water. I will stick to other brands of HUMIDIFIERS for my
use. Pure does not offer the cartridges on their site. SK makes the cartridges not the humidifiers.