Nu-Stat removes the tough grease, dirt, dust and allergens that collect on electrostatic furnace filters. Once-a-month treatment with Nu-Stat will keep your filter clean so it can perform at peak efficiency. And Nu-Stat is environmentally friendly - no chlorine, no odor, and 100% biodegradable. Just spray it on, allow to stand for a minute, and then rinse, leaving your furnace filter clean and working like new! Good for all makes of permanent, electrostatic furnace filters. Quart bottle with sprayer.