Dual-pack of SCUMBALLS® oil-absorbing sponges designed to eliminate surface oils, lotions, and scum from hot tubs and spas Each sponge absorbs up to 43× its weight in body oils, cosmetics, suntan lotion, and other contaminants Helps prevent waterline buildup, cloudy water, and clogged filters, extending the life of your spa filtration system Soft, floating design works while the spa is in use—just toss one in and let it float Reusable and easy to clean—simply rinse and reuse until saturated or discolored Compatible with chlorine, bromine, mineral, and saltwater systems Ideal for spas, hot tubs, and small pools; one sponge per 500 gallons is recommended Made in the USA using non-toxic, spa-safe materials for peace of mind