Easy to use: Pour directly into your spa filter, no need to check or replace it for the next four months. Environmentally friendly: Clean, clear water, no high chlorine or bromine levels. An environmentally friendly and easy-care alternative that keeps your spa and hot tub clean and free of harmful bacteria. Skin Type, Swimsuits, and Bathing Suits: No more worries about skin irritation, fading of your swimsuit, or hot tub cover. Suitable Environments: The water purifier is ideal for outdoor pools, spa pools, bathtubs, hot tubs, whirlpools, and more. Wide Compatibility: Works with your existing filtration system and all spa flow rates. Product Information Delivery Quantity: 1 Pack Product Specifications: 3.2 x 3.2 x 41 cm Product Color: Yellow Product Material: ABS + Minerals