SpaChoice 1.5-Pounds 2-Pack Premium Brominating Tabs Sanitizer for Spas, Bromine Tablets for Spa Hot Tub, Made in USABrand: SpaChoice Features: Introduce 3 tablets per 300 gallons of spa water with the use of a floating tablet feeder Maintain spa by adding 3 tablets per 300 gallons every 5 7 days or as needed Before initially using this product in your spa or hot tub you will need to add 1 2 ounce of sodium bromide for each 100 gallons of water Bromine is an alternative to chlorine as a way to sanitize spa or hot tub water Bromine does not give off much of an odor