PurCool Green strips and tablets prevent sludge build-up in air conditioning and refrigeration condensate drain pans. They utilize unique, environmentally friendly plant-based suspending and dispersing action to prevent build-ups, overflows, and odors in drain pans. When placed in the drain pan, PurCool Green will slowly dissolve in the condensate water, providing preventative treatment for 4-6 months. PurCool Green does not contain any harsh chemicals or biocides, making them safer for the user and the environment. Use in all A/C air handlers, fan coil units, window units, mini splits, and refrigeration condensate drain pans.