Jack's Magic® Products is the pool and spa industry’s leader in identifying, preventing and removing stains and discoloration. The Jack's Magic 3-Step Stain Program was developed to Identify, Remove & Prevent swimming pool & spa stains below the waterline, while our Power Blue™ line of products tackle tough stains & scale above the waterline. All of our products were designed to be used with the water left IN the pool, saving you time & money, and leaving your pool sparkling and clear.