Newstone Spa Bag Mineral Sanitizer Granules (500g or 1.1 lb) Mineral bag for spas. Works up to approximately 550 Liter( 145 Gallon) tub. Made in Japan, No chlorine or bromine sanitizer granules. Comes with mesh bag to put granules inside spa. Mesh bag with granules can be simply put in any type of spa, because it is not a cartridge type. You simply put it inside the spa or tub or hang it inside. Keep your spa free from harmful bacteria Reduces need for harsh chemicals; less skin irritation