Nature2 Spa Mineral Sanitizer 2 Pack W20750 MulticolorBrand: Nature2 Color: Multicolor Features: Drops directly into spa filter Works with existing filtration system For spas up to 500 gallons Works with all spa flow rates Last an average of four months model number: W20750 Part Number: W20750 Details: The Nature 2 Spa Mineral Sanitizer is an organic way to sanitize your hot tub. For spas up to 500 gallons, it uses mineral bed technology to keep water clean, soft and silky while reducing the use of