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Keep your home cool and fresh with Big Ass Fans evaporative cooler accessory PK4, designed specifically for use with their indoor-outdoor coolers. Made in the USA and sold by a Veteran-Owned Business, these algae tablets effectively absorb water and release it through the air, providing an efficient way to cool your space naturally. Measuring 5 inches high, 2 1/2 inches long, and 2 1/2 inches wide, these compact tablets are easy to store and can be used in any indoor or outdoor setting. Improve the air quality and temperature of your home with this eco-friendly solution from Big Ass Fans.