The Hamilton WT 208-C is the correct water treatment tablets for the following humidifier models:
The Hamilton Water Treatment Tablets for Humidifiers are compatible for use with all Hamilton drum-type humidifier models. The Hamilton WT 208-C includes 16 water treatment tablets that control lime scale build-up, keep humidifier water fresh and clean, and prolong the life of your Hamilton drum humidifier. Simply drop these tablets into your water pan and the water will be conditioned to draw minerals to the bottom of the pan, away from your drum assembly and evaporator pad.
Hamilton Water Treatment Tablets for Humidifiers specifications: