PurCool™Green stripsprevent slime and sludge build-up in mini-split 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.