Gordon's PondMaster 3251072 Algaecide, Liquid, Light Blue, 1 gal

Copper based product that works best applied at the first sign of algal bloom. Designed to be used in standing or slow moving water to remove slime. Labeled for control of a broad spectrum of algae including cyanophyceae, chlorophyceae, protoza and diatomaceae. Immediate access to treated water. No holding periods or reentry restrictions. Effective in hard water. Non-corrosive to spray equipment.