Jack's Magic The Vinyl Blue Stuff improves the water quality in your pool! The Vinyl Liner Blue Stuff is a high performance product specifically formulated to prevent metal stains and scaling in vinyl and fiberglass pools.
Developed to work with vinyl pools with heaters as well as regular vinyl and fiberglass pools.
Helps to prevent stains, including copper, and scaling.
Powerfully removes metal stains and scale.
Fast acting product, which reduces overall maintenance time.