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About Think CrucialThink Crucial builds super-concentrate cleaning solutions for households that read ingredient labels. Our humidifier drops deliver real chelant chemistry from three food-grade ingredients — nothing proprietary, nothing you can't pronounce.Why Choose The PurifierSuper-Concentrate Strength: A little goes a long way — just two drops condition a full one-gallon tank, so one small bottle keeps working refill after refill.3 Food-Grade Ingredients: Distilled water, citric acid, and sodium citrate. The same chelant chemistry found in kettle descalers and dishwasher tabs.No Metals, No Mystery: No silver, no copper, no surfactants, no fragrance, no dye, and no proprietary blends.550+ Uses Per Bottle: One 2 fl oz dropper bottle covers four-plus heating seasons of daily humidifier use.How To UseFill your humidifier tank with tap water. Add 1 drop for half-gallon tanks, 2 drops for one-gallon, and 4 drops for two-gallon. Add a few extra drops in hard-water households. Swirl, install the tank, and run normally. Repeat at every refill, daily or weekly, however often your humidifier runs.Quality StandardsCitric acid and sodium citrate are food-grade. The formula is gentle on plastic, stainless steel, and silicone tank surfaces, and rinses clean without leaving residue behind.Compatible WithBest for evaporative and warm-mist humidifiers from Honeywell, Vornado, AIRCARE, Essick Air, Vicks, and other major brands with wick or warm-mist tanks. Works on whole-house consoles, tower units, and bedroom or office tabletop humidifiers. Check your manual; some ultrasonic models specify distilled water only.Our PromiseThree food-grade ingredients, no metals, and no proprietary mystery blends — clean humidifier care built for label-reading homes. 550+ USES PER BOTTLE FROM A 33% SUPER CONCENTRATE FORMULA: One 2 fl oz bottle delivers over 550 humidifier refills at 2 drops per 1-gallon tank. That works to roughly 4+ heating seasons of daily use - refill after refill of clean humidifier care 33% SUPER CONCENTRATE - JUST 3 FOOD-GRADE INGREDIENTS: Distilled water, citric acid, and sodium citrate - that is our full ingredient list. No silver, no copper, no metals, no surfactants, no fragrance, no dye. Built for the label-reading household REDUCES MINERAL DEPOSITS BETWEEN CLEANINGS: Hard tap water leaves white mineral film on tank walls and white dust on nearby furniture. Our citric-citrate chelant system sequesters calcium and magnesium ions before they precipitate inside the tank COMPATIBLE WITH EVAPORATIVE & WARM-MIST HUMIDIFIERS: Works with Honeywell, Vornado, AIRCARE, Essick Air, and Vicks tank models. Precision dropper dosing - 1 drop for 0.5-gal tanks, 2 drops for 1-gal, 4 drops for 2-gal; add 50% more drops in hard water MADE IN USA FOR CLEAN-INGREDIENT HOMES: For the bedroom, living room, office, or whole-home humidifier owner who wants a non-metal water conditioner with no proprietary mystery ingredients. Sourced domestically; bottled in Hollywood, Florida USA COST-EFFECTIVE SOLUTION: At approximately $0.024 per refill, this super concentrate formula provides exceptional value with over 550 uses from a single 2 fl oz bottle, covering multiple heating seasons of continuous daily humidifier operation UPC 860015737182 ASIN B0H37NZS1P Color clear Capacity 2 Fluid Ounces Room Type Bedroom, Living Room, Office Brand Name Think Crucial Model Name TC-PURIFIER-2OZ Part Number TC-PURIFIER-2OZ Manufacturer Think Crucial Model Number TC-PURIFIER-2OZ Included Components Dropper bottle Other Special Features of the Product Reduces mineral deposits, Food-grade ingredients, No metals, No fragrance, No dye