The SpaGuard Spa Calcium Hardness Increaser 12 oz - 6 Pack is a product designed to help maintain the calcium hardness levels in spa pools. Made by the brand SpaGuard, this product is specifically formulated to increase calcium hardness in spa water, promoting a more balanced pH level and creating a more comfortable and soothing environment for spa users. This product comes in a convenient 6-pack size, making it easy to keep your spa water in optimal condition for extended periods of time. Sold as is