Bio-Dex Protect All SupremeThe Bio Dex Protect All Supreme is a specially formulated stain and scale product that will remove calcium, iron, rust, corrosion and other organic scale buildups. Using this at the start of the season and at the end of the season during winterization will help to eliminate hard water, as well as lower unwanted phosphates. Protect All Supreme is compatible with all filter media types and salt systems. Removes calcium, iron, rust, corrosion and other