Bio-Dex Aqua PureThe Bio Dex Aqua Pure product is a specially formulated algaecide that is intended to target all common forms and colors of algae. It uses a copper based formula that can help prevent copper staining, which most other copper based algaecides can have a problem with. The algaecide is compatible with most chemicals normally used in pool maintenance. This is not a stand alone product, because it must be used in conjunction with halogen based pool