90-Day Algicide Returning An Empty Bottle?:Yes and blue-green algae

and blue-green algae

It’s effective over a wide pH range

and fiberglass surfaces

A clear comparator block and color-coded instructions make it simple to use

Quickly clears floating debris from pool and spa surfaces

90-Day Algicide Returning An Empty Bottle?:Yes and blue-green algaeLong lasting protection. Just one dose every 3 months This 90 Day Algicide is a powerful, copper based formula designed to kill and prevent all common types of pool algae including black, blue green, and mustard varieties. One treatment lasts up to 90 days, keeping your water clear and protected all season long. The non staining, slow release formula is safe for all pool finishes and works alongside chlorine, bromine, and saltwater systems. It