Omni Algae Terminator is highly effective, patented, and non-staining algaecide that kills and controls all types of pool algae. This product is especially recommended for killing and controlling green, blue green (frequently called black or spot algae) and mustard algae growths. This versatile algaecide can be used in pools sanitized with chlorine or bromine, and in pools of all surface and filter types. Algae Terminator is highly concentrated. It works fast to kill algae and keep your pool looking great.