Leisure Time D-04 Metal Gon, 1-Pint, 4-PackBrand: Leisure Time Features: Concentrated formula prevents iron and other metal buildup on your hot tub or spa; Prevents stains caused by iron or other metals When combined with Defender, this spa care chemical helps prevent scale formation You only need to use it once at the fill or refill with new spa water model number: D 04 Part Number: D 04 Details: Metal Gon from Leisure Time sequesters iron, copper and other minerals that get into your spa or